diff --git a/src/Sbp/Requests/CashLink/ActivateCashQrRequest.php b/src/Sbp/Requests/CashLink/ActivateCashQrRequest.php
index a3df866..907d8bd 100644
--- a/src/Sbp/Requests/CashLink/ActivateCashQrRequest.php
+++ b/src/Sbp/Requests/CashLink/ActivateCashQrRequest.php
@@ -13,11 +13,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 // <SECTION name="module_imports" intent="Import DTO and Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request requires the `ActivateCashQrRequestData` DTO for its JSON body and utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
 use Apoloz\AlfaBank\Sbp\Data\CashLink\ActivateCashQrRequestData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -25,7 +26,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for activating a CashLink QR Code, a key management operation in SBP payment systems.">
 class ActivateCashQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Activating a resource is an action that changes the system state, so POST is the correct verb.">
@@ -56,9 +57,9 @@ class ActivateCashQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Fields from the DTO are mapped, including conditional parameters for order number, payment purpose, QR TTL, and notification URLs.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'ActivateCashQRc',
             'TermNo' => $this->data->TermNo,
             'qrcId' => $this->data->qrcId,
@@ -67,22 +68,22 @@ class ActivateCashQrRequest extends Request implements HasBody
         ];
 
         if ($this->data->OrderNumber !== null) {
-            $body['OrderNumber'] = $this->data->OrderNumber;
+            $bodyArray['OrderNumber'] = $this->data->OrderNumber;
         }
         if ($this->data->paymentPurpose !== null) {
-            $body['paymentPurpose'] = $this->data->paymentPurpose;
+            $bodyArray['paymentPurpose'] = $this->data->paymentPurpose;
         }
         if ($this->data->qrTtl !== null) {
-            $body['qrTtl'] = $this->data->qrTtl;
+            $bodyArray['qrTtl'] = $this->data->qrTtl;
         }
         if ($this->data->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->data->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->data->redirectUrl;
         }
         if ($this->data->notificationUrl !== null) {
-            $body['queryData'] = ['notificationUrl' => $this->data->notificationUrl];
+            $bodyArray['queryData'] = ['notificationUrl' => $this->data->notificationUrl];
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/ChangeAccountForCashQrRequest.php b/src/Sbp/Requests/CashLink/ChangeAccountForCashQrRequest.php
index 4550117..7a0e820 100644
--- a/src/Sbp/Requests/CashLink/ChangeAccountForCashQrRequest.php
+++ b/src/Sbp/Requests/CashLink/ChangeAccountForCashQrRequest.php
@@ -12,20 +12,20 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to change the account for a CashLink QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for modifying a CashLink QR Code, which is a key management operation.">
 class ChangeAccountForCashQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Modifying a resource via an action is correctly represented by a POST request in the SBP API context.">
@@ -53,7 +53,7 @@ class ChangeAccountForCashQrRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Return the raw JSON response as an array.">
     // <BELIEF_STATE "For this specific request, the response is currently returned as a raw array. A dedicated DTO could be created if a structured object is required.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): array
+    public function createDtoFromResponse(Response $response): array
     {
         return $response->json();
     }
@@ -61,9 +61,9 @@ class ChangeAccountForCashQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Fields are conditionally added based on constructor parameters, ensuring the payload precisely matches the API specification.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'ChangeAccForCashQRc',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
@@ -71,16 +71,16 @@ class ChangeAccountForCashQrRequest extends Request implements HasBody
         ];
 
         if ($this->NewTermNo !== null) {
-            $body['NewTermNo'] = $this->NewTermNo;
+            $bodyArray['NewTermNo'] = $this->NewTermNo;
         }
         if ($this->NewMerchantId !== null) {
-            $body['NewMerchantId'] = $this->NewMerchantId;
+            $bodyArray['NewMerchantId'] = $this->NewMerchantId;
         }
         if ($this->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->redirectUrl;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/ChangeTermNoForCashQrRequest.php b/src/Sbp/Requests/CashLink/ChangeTermNoForCashQrRequest.php
index 94910ca..eae6cb1 100644
--- a/src/Sbp/Requests/CashLink/ChangeTermNoForCashQrRequest.php
+++ b/src/Sbp/Requests/CashLink/ChangeTermNoForCashQrRequest.php
@@ -12,20 +12,20 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to change the terminal number for a CashLink QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for modifying a CashLink QR Code, specifically its associated terminal, which is a key management operation.">
 class ChangeTermNoForCashQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Modifying a resource via an action is correctly represented by a POST request in the SBP API context.">
@@ -49,7 +49,7 @@ class ChangeTermNoForCashQrRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Return the raw JSON response as an array.">
     // <BELIEF_STATE "For this specific request, the response is currently returned as a raw array. A dedicated DTO could be created if a structured object is required.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): array
+    public function createDtoFromResponse(Response $response): array
     {
         return $response->json();
     }
@@ -57,13 +57,15 @@ class ChangeTermNoForCashQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` and `qrcId` are included in the body to identify the target.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'ChangeTermNoForCashQRc',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/DeleteCashQrRequest.php b/src/Sbp/Requests/CashLink/DeleteCashQrRequest.php
index 116bcd7..9d8236b 100644
--- a/src/Sbp/Requests/CashLink/DeleteCashQrRequest.php
+++ b/src/Sbp/Requests/CashLink/DeleteCashQrRequest.php
@@ -12,20 +12,20 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to delete a CashLink QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for deleting a CashLink QR Code, which is a critical management operation.">
 class DeleteCashQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Deleting a resource via an action is correctly represented by a POST request in the SBP API context.">
@@ -49,7 +49,7 @@ class DeleteCashQrRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Return the raw JSON response as an array.">
     // <BELIEF_STATE "For this specific request, the response is currently returned as a raw array. A dedicated DTO could be created if a structured object is required.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): array
+    public function createDtoFromResponse(Response $response): array
     {
         return $response->json();
     }
@@ -57,13 +57,15 @@ class DeleteCashQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` and `qrcId` are included in the body to identify the target.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'DelCashQRc',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/GetCashQrHistoryRequest.php b/src/Sbp/Requests/CashLink/GetCashQrHistoryRequest.php
index 4f8f7d4..3480e3f 100644
--- a/src/Sbp/Requests/CashLink/GetCashQrHistoryRequest.php
+++ b/src/Sbp/Requests/CashLink/GetCashQrHistoryRequest.php
@@ -12,20 +12,20 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to get the history of a CashLink QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for querying the history of a CashLink QR Code, which is useful for auditing and reconciliation.">
 class GetCashQrHistoryRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP history requests are often performed via POST requests with a JSON body.">
@@ -51,7 +51,7 @@ class GetCashQrHistoryRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Return the raw JSON response as an array.">
     // <BELIEF_STATE "For this specific request, the response is currently returned as a raw array. A dedicated DTO could be created if a structured object is required.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): array
+    public function createDtoFromResponse(Response $response): array
     {
         return $response->json();
     }
@@ -59,15 +59,17 @@ class GetCashQrHistoryRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. All constructor properties are directly mapped to the request body to identify the QR Code and the date range.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'GetCashQrcId',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
             'dateFrom' => $this->dateFrom,
             'dateTo' => $this->dateTo,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/GetCashQrStatusRequest.php b/src/Sbp/Requests/CashLink/GetCashQrStatusRequest.php
index f4fb889..06688c8 100644
--- a/src/Sbp/Requests/CashLink/GetCashQrStatusRequest.php
+++ b/src/Sbp/Requests/CashLink/GetCashQrStatusRequest.php
@@ -12,20 +12,20 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to get the status of a CashLink QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of a CashLink QR Code, which is crucial for tracking payment flows.">
 class GetCashQrStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -49,7 +49,7 @@ class GetCashQrStatusRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Return the raw JSON response as an array.">
     // <BELIEF_STATE "For this specific request, the response is currently returned as a raw array. A dedicated DTO could be created if a structured object is required.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): array
+    public function createDtoFromResponse(Response $response): array
     {
         return $response->json();
     }
@@ -57,13 +57,15 @@ class GetCashQrStatusRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` and `qrcId` identify the target.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'GetCashQRCstatus',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/CashLink/RegCashQrRequest.php b/src/Sbp/Requests/CashLink/RegCashQrRequest.php
index 2315d35..6474d87 100644
--- a/src/Sbp/Requests/CashLink/RegCashQrRequest.php
+++ b/src/Sbp/Requests/CashLink/RegCashQrRequest.php
@@ -14,11 +14,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\CashLink;
 // <BELIEF_STATE "This POST request requires specific DTOs for its JSON body and its response, along with Saloon's body-handling traits.">
 use Apoloz\AlfaBank\Sbp\Data\CashLink\RegCashQrRequestData;
 use Apoloz\AlfaBank\Sbp\Data\CashLink\RegCashQrResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -26,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for generating a CashLink QR Code, a key feature in SBP payment systems.">
 class RegCashQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Creating a new QR Code resource or initiating a generation action is correctly represented by a POST request.">
@@ -57,30 +58,30 @@ class RegCashQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Fields from the DTO are mapped, including conditional parameters for media type, dimensions, redirect URL, and QR Code ID.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'RegCashQRc',
             'TermNo' => $this->data->TermNo,
         ];
 
         if ($this->data->mediaType !== null) {
-            $body['mediaType'] = $this->data->mediaType;
+            $bodyArray['mediaType'] = $this->data->mediaType;
         }
         if ($this->data->width !== null) {
-            $body['width'] = $this->data->width;
+            $bodyArray['width'] = $this->data->width;
         }
         if ($this->data->height !== null) {
-            $body['height'] = $this->data->height;
+            $bodyArray['height'] = $this->data->height;
         }
         if ($this->data->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->data->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->data->redirectUrl;
         }
         if ($this->data->qrcId !== null) {
-            $body['qrcId'] = $this->data->qrcId;
+            $bodyArray['qrcId'] = $this->data->qrcId;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/DigitalRuble/CashLink/ChangeAccForCashUniQrRequest.php b/src/Sbp/Requests/DigitalRuble/CashLink/ChangeAccForCashUniQrRequest.php
index 635c216..0fbed08 100644
--- a/src/Sbp/Requests/DigitalRuble/CashLink/ChangeAccForCashUniQrRequest.php
+++ b/src/Sbp/Requests/DigitalRuble/CashLink/ChangeAccForCashUniQrRequest.php
@@ -18,7 +18,6 @@ use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
 
 // </SECTION>
 
@@ -26,7 +25,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for modifying a Digital Ruble CashLink QR Code, which is a key management operation.">
 class ChangeAccForCashUniQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Modifying a resource via an action is correctly represented by a POST request in the SBP API context.">
@@ -57,42 +56,42 @@ class ChangeAccForCashUniQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Fields from the DTO are mapped, including conditional parameters for the new account, merchant, redirect URL, etc.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'ChangeAccForCashUniQr',
             'TermNo' => $this->data->TermNo,
         ];
 
         if ($this->data->messageID !== null) {
-            $body['messageID'] = $this->data->messageID;
+            $bodyArray['messageID'] = $this->data->messageID;
         }
         if ($this->data->qrcId !== null) {
-            $body['qrcId'] = $this->data->qrcId;
+            $bodyArray['qrcId'] = $this->data->qrcId;
         }
         if ($this->data->account !== null) {
-            $body['account'] = $this->data->account;
+            $bodyArray['account'] = $this->data->account;
         }
         if ($this->data->accountDR !== null) {
-            $body['accountDR'] = $this->data->accountDR;
+            $bodyArray['accountDR'] = $this->data->accountDR;
         }
         if ($this->data->NewTermNo !== null) {
-            $body['NewTermNo'] = $this->data->NewTermNo;
+            $bodyArray['NewTermNo'] = $this->data->NewTermNo;
         }
         if ($this->data->NewMerchantId !== null) {
-            $body['NewMerchantId'] = $this->data->NewMerchantId;
+            $bodyArray['NewMerchantId'] = $this->data->NewMerchantId;
         }
         if ($this->data->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->data->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->data->redirectUrl;
         }
         if ($this->data->paymentPageUrl !== null) {
-            $body['paymentPageUrl'] = $this->data->paymentPageUrl;
+            $bodyArray['paymentPageUrl'] = $this->data->paymentPageUrl;
         }
         if ($this->data->fraudScore !== null) {
-            $body['fraudScore'] = $this->data->fraudScore;
+            $bodyArray['fraudScore'] = $this->data->fraudScore;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/DigitalRuble/CashLink/CreateCashUniQrRequest.php b/src/Sbp/Requests/DigitalRuble/CashLink/CreateCashUniQrRequest.php
index bc5d82b..d126621 100644
--- a/src/Sbp/Requests/DigitalRuble/CashLink/CreateCashUniQrRequest.php
+++ b/src/Sbp/Requests/DigitalRuble/CashLink/CreateCashUniQrRequest.php
@@ -18,7 +18,6 @@ use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
 
 // </SECTION>
 
@@ -26,7 +25,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for generating a Digital Ruble CashLink QR Code, a key feature in the SBP Digital Ruble operations.">
 class CreateCashUniQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Creating a new QR Code resource or initiating a generation action is correctly represented by a POST request.">
@@ -57,40 +56,40 @@ class CreateCashUniQrRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Fields from the DTO are mapped, including conditional and nested `queryData` for notification URLs.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'ReqCashUniQr',
             'TermNo' => $this->data->TermNo,
         ];
 
         if ($this->data->messageID !== null) {
-            $body['messageID'] = $this->data->messageID;
+            $bodyArray['messageID'] = $this->data->messageID;
         }
         if ($this->data->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->data->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->data->redirectUrl;
         }
         if ($this->data->paymentPageUrl !== null) {
-            $body['paymentPageUrl'] = $this->data->paymentPageUrl;
+            $bodyArray['paymentPageUrl'] = $this->data->paymentPageUrl;
         }
         if ($this->data->mediaType !== null) {
-            $body['mediaType'] = $this->data->mediaType;
+            $bodyArray['mediaType'] = $this->data->mediaType;
         }
         if ($this->data->width !== null) {
-            $body['width'] = $this->data->width;
+            $bodyArray['width'] = $this->data->width;
         }
         if ($this->data->height !== null) {
-            $body['height'] = $this->data->height;
+            $bodyArray['height'] = $this->data->height;
         }
         if ($this->data->qrcId !== null) {
-            $body['qrcId'] = $this->data->qrcId;
+            $bodyArray['qrcId'] = $this->data->qrcId;
         }
 
         if ($this->data->notificationUrl !== null) {
-            $body['queryData'] = ['notificationUrl' => $this->data->notificationUrl];
+            $bodyArray['queryData'] = ['notificationUrl' => $this->data->notificationUrl];
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/DigitalRuble/CashLink/GetCashUniQrStatusRequest.php b/src/Sbp/Requests/DigitalRuble/CashLink/GetCashUniQrStatusRequest.php
index 18f9d25..ebd62b6 100644
--- a/src/Sbp/Requests/DigitalRuble/CashLink/GetCashUniQrStatusRequest.php
+++ b/src/Sbp/Requests/DigitalRuble/CashLink/GetCashUniQrStatusRequest.php
@@ -18,7 +18,6 @@ use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
 
 // </SECTION>
 
@@ -26,7 +25,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of a Digital Ruble CashLink QR Code, which is crucial for tracking payment flows.">
 class GetCashUniQrStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -57,9 +56,9 @@ class GetCashUniQrStatusRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo`, `uniQrId`, and `paramsId` identify the target. Optional fields like `messageID` and `payrrn` provide additional context.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'GetCashUniQrStatus',
             'TermNo' => $this->data->TermNo,
             'uniQrId' => $this->data->uniQrId,
@@ -67,13 +66,13 @@ class GetCashUniQrStatusRequest extends Request implements HasBody
         ];
 
         if ($this->data->messageID !== null) {
-            $body['messageID'] = $this->data->messageID;
+            $bodyArray['messageID'] = $this->data->messageID;
         }
         if ($this->data->payrrn !== null) {
-            $body['payrrn'] = $this->data->payrrn;
+            $bodyArray['payrrn'] = $this->data->payrrn;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/DigitalRuble/CreateUniQrRequest.php b/src/Sbp/Requests/DigitalRuble/CreateUniQrRequest.php
index 9a24fdb..dba56ce 100644
--- a/src/Sbp/Requests/DigitalRuble/CreateUniQrRequest.php
+++ b/src/Sbp/Requests/DigitalRuble/CreateUniQrRequest.php
@@ -6,15 +6,16 @@ namespace Apoloz\AlfaBank\Sbp\Requests\DigitalRuble;
 
 use Apoloz\AlfaBank\Sbp\Data\DigitalRuble\CreateUniQrRequestData;
 use Apoloz\AlfaBank\Sbp\Data\DigitalRuble\UniQrResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 class CreateUniQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     protected Method $method = Method::POST;
 
@@ -32,40 +33,40 @@ class CreateUniQrRequest extends Request implements HasBody
         return UniQrResponseData::from($response->json());
     }
 
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'ReqUniQr',
             'TermNo' => $this->data->TermNo,
             'uniQrType' => $this->data->uniQrType,
         ];
 
         if ($this->data->amount !== null) {
-            $body['amount'] = $this->data->amount;
+            $bodyArray['amount'] = $this->data->amount;
         }
         if ($this->data->paymentPurpose !== null) {
-            $body['paymentPurpose'] = $this->data->paymentPurpose;
+            $bodyArray['paymentPurpose'] = $this->data->paymentPurpose;
         }
         if ($this->data->redirectUrl !== null) {
-            $body['redirectUrl'] = $this->data->redirectUrl;
+            $bodyArray['redirectUrl'] = $this->data->redirectUrl;
         }
         if ($this->data->paymentPageUrl !== null) {
-            $body['paymentPageUrl'] = $this->data->paymentPageUrl;
+            $bodyArray['paymentPageUrl'] = $this->data->paymentPageUrl;
         }
         if ($this->data->mediaType !== null) {
-            $body['mediaType'] = $this->data->mediaType;
+            $bodyArray['mediaType'] = $this->data->mediaType;
         }
         if ($this->data->width !== null) {
-            $body['width'] = $this->data->width;
+            $bodyArray['width'] = $this->data->width;
         }
         if ($this->data->height !== null) {
-            $body['height'] = $this->data->height;
+            $bodyArray['height'] = $this->data->height;
         }
         if ($this->data->qrTtl !== null) {
-            $body['qrTtl'] = $this->data->qrTtl;
+            $bodyArray['qrTtl'] = $this->data->qrTtl;
         }
         if ($this->data->messageID !== null) {
-            $body['messageID'] = $this->data->messageID;
+            $bodyArray['messageID'] = $this->data->messageID;
         }
 
         $queryData = [];
@@ -83,9 +84,9 @@ class CreateUniQrRequest extends Request implements HasBody
         }
 
         if (! empty($queryData)) {
-            $body['queryData'] = $queryData;
+            $bodyArray['queryData'] = $queryData;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
 }
diff --git a/src/Sbp/Requests/DigitalRuble/GetUniQrStatusRequest.php b/src/Sbp/Requests/DigitalRuble/GetUniQrStatusRequest.php
index b4648ec..622a3d2 100644
--- a/src/Sbp/Requests/DigitalRuble/GetUniQrStatusRequest.php
+++ b/src/Sbp/Requests/DigitalRuble/GetUniQrStatusRequest.php
@@ -12,20 +12,21 @@ namespace Apoloz\AlfaBank\Sbp\Requests\DigitalRuble;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Sbp\Data\DigitalRuble\GetUniQrStatusResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to get the status of Universal QR Codes.">
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of multiple Uni QR Codes, which is part of managing digital ruble transactions.">
 class GetUniQrStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -49,21 +50,23 @@ class GetUniQrStatusRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `GetUniQrStatusResponseData` DTO provides a type-safe and structured object for the status of Universal QR Codes.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): \Apoloz\AlfaBank\Sbp\Data\DigitalRuble\GetUniQrStatusResponseData
+    public function createDtoFromResponse(Response $response): GetUniQrStatusResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\DigitalRuble\GetUniQrStatusResponseData::from($response->json());
+        return GetUniQrStatusResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` and `uniQrIds` are included in the body to identify the targets.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'GetUniQrStatus',
             'TermNo' => $this->TermNo,
             'uniQrIds' => $this->uniQrIds,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Management/BlockQrRequest.php b/src/Sbp/Requests/Management/BlockQrRequest.php
index 9150ff1..2aa4a16 100644
--- a/src/Sbp/Requests/Management/BlockQrRequest.php
+++ b/src/Sbp/Requests/Management/BlockQrRequest.php
@@ -13,20 +13,21 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Management;
 // <SECTION name="module_imports" intent="Import DTO and Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request requires the `BlockQrRequestData` DTO for its JSON body and utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
 use Apoloz\AlfaBank\Sbp\Data\Management\BlockQrRequestData;
+use Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to block a QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for blocking an SBP QR Code, which is a critical management operation.">
 class BlockQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Blocking a resource is an action that changes the system state, so POST is the correct verb.">
@@ -49,20 +50,22 @@ class BlockQrRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `SbpManagementResponseData` DTO provides a structured object for the result of the block operation.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): \Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData
+    public function createDtoFromResponse(Response $response): SbpManagementResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData::from($response->json());
+        return SbpManagementResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Using the DTO's `toArray` method ensures the payload is correctly structured.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'BlockQRcId'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Management/GetBlockedQrListRequest.php b/src/Sbp/Requests/Management/GetBlockedQrListRequest.php
index 3236afd..724ab7a 100644
--- a/src/Sbp/Requests/Management/GetBlockedQrListRequest.php
+++ b/src/Sbp/Requests/Management/GetBlockedQrListRequest.php
@@ -12,20 +12,21 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Management;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Sbp\Data\Management\GetBlockedQrListResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to get a list of blocked QR Codes.">
 // <BELIEF_STATE "This class encapsulates the logic for querying blocked QR Codes, which is part of managing payment terminals.">
 class GetBlockedQrListRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP list requests are often performed via POST requests with a JSON body.">
@@ -48,20 +49,22 @@ class GetBlockedQrListRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `GetBlockedQrListResponseData` DTO provides a type-safe object for the list of blocked QR Codes.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): \Apoloz\AlfaBank\Sbp\Data\Management\GetBlockedQrListResponseData
+    public function createDtoFromResponse(Response $response): GetBlockedQrListResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Management\GetBlockedQrListResponseData::from($response->json());
+        return GetBlockedQrListResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` is included in the body to identify the terminal.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'GetBlockedQRcIdList',
             'TermNo' => $this->TermNo,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Management/UnblockQrRequest.php b/src/Sbp/Requests/Management/UnblockQrRequest.php
index 34039a2..adcdd93 100644
--- a/src/Sbp/Requests/Management/UnblockQrRequest.php
+++ b/src/Sbp/Requests/Management/UnblockQrRequest.php
@@ -13,20 +13,21 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Management;
 // <SECTION name="module_imports" intent="Import DTO and Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request requires the `BlockQrRequestData` DTO for its JSON body and utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
 use Apoloz\AlfaBank\Sbp\Data\Management\BlockQrRequestData;
+use Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to unblock a QR Code.">
 // <BELIEF_STATE "This class encapsulates the logic for unblocking an SBP QR Code, which is a critical management operation.">
 class UnblockQrRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Unblocking a resource is an action that changes the system state, so POST is the correct verb.">
@@ -49,20 +50,22 @@ class UnblockQrRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `SbpManagementResponseData` DTO provides a structured object for the result of the unblock operation.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): \Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData
+    public function createDtoFromResponse(Response $response): SbpManagementResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Management\SbpManagementResponseData::from($response->json());
+        return SbpManagementResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Using the DTO's `toArray` method ensures the payload is correctly structured.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'UnblockQRcId'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Registry/GetBankListRequest.php b/src/Sbp/Requests/Registry/GetBankListRequest.php
index 9c6d5f6..c4d3318 100644
--- a/src/Sbp/Requests/Registry/GetBankListRequest.php
+++ b/src/Sbp/Requests/Registry/GetBankListRequest.php
@@ -13,11 +13,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Registry;
 // <SECTION name="module_imports" intent="Import DTO and Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request requires the `GetBankListResponseData` DTO for its response and utilizes `HasBody` and `HasJsonBody` for proper payload serialization.">
 use Apoloz\AlfaBank\Sbp\Data\Registry\GetBankListResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -25,7 +26,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for querying the list of SBP participating banks, which is essential for routing payments.">
 class GetBankListRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP list requests are often performed via POST requests with a JSON body.">
@@ -57,20 +58,20 @@ class GetBankListRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Optional fields are conditionally added to the body.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'GetBankList',
         ];
 
         if ($this->messageID !== null) {
-            $body['messageID'] = $this->messageID;
+            $bodyArray['messageID'] = $this->messageID;
         }
         if ($this->BankMemberIdFilter !== null) {
-            $body['BankMemberIdFilter'] = $this->BankMemberIdFilter;
+            $bodyArray['BankMemberIdFilter'] = $this->BankMemberIdFilter;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Reversal/GetQrcReversalDataRequest.php b/src/Sbp/Requests/Reversal/GetQrcReversalDataRequest.php
index 57d587f..50d75b2 100644
--- a/src/Sbp/Requests/Reversal/GetQrcReversalDataRequest.php
+++ b/src/Sbp/Requests/Reversal/GetQrcReversalDataRequest.php
@@ -14,11 +14,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Reversal;
 // <BELIEF_STATE "This POST request requires specific DTOs for its JSON body and its response, along with Saloon's body-handling traits.">
 use Apoloz\AlfaBank\Sbp\Data\Reversal\GetQrcReversalDataRequestData;
 use Apoloz\AlfaBank\Sbp\Data\Reversal\GetQrcReversalDataResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -26,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for querying detailed SBP reversal information, which is crucial for auditing and reconciliation.">
 class GetQrcReversalDataRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP data requests are often performed via POST requests with a JSON body.">
@@ -57,12 +58,14 @@ class GetQrcReversalDataRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Other fields from the DTO are conditionally added, ensuring the payload precisely matches the API specification.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'GetQRCreversalData'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Reversal/GetQrcReversalHistoryRequest.php b/src/Sbp/Requests/Reversal/GetQrcReversalHistoryRequest.php
index 1b25da1..813216c 100644
--- a/src/Sbp/Requests/Reversal/GetQrcReversalHistoryRequest.php
+++ b/src/Sbp/Requests/Reversal/GetQrcReversalHistoryRequest.php
@@ -5,15 +5,16 @@ declare(strict_types=1);
 namespace Apoloz\AlfaBank\Sbp\Requests\Reversal;
 
 use Apoloz\AlfaBank\Sbp\Data\Reversal\ReversalHistoryResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 class GetQrcReversalHistoryRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     protected Method $method = Method::POST;
 
@@ -32,12 +33,14 @@ class GetQrcReversalHistoryRequest extends Request implements HasBody
         return ReversalHistoryResponseData::from($response->json());
     }
 
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'GetQRCreversalHistory',
             'TermNo' => $this->TermNo,
             'payrrn' => $this->payrrn,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
 }
diff --git a/src/Sbp/Requests/Reversal/GetQrcReversalStatusRequest.php b/src/Sbp/Requests/Reversal/GetQrcReversalStatusRequest.php
index bcd3d0f..7634775 100644
--- a/src/Sbp/Requests/Reversal/GetQrcReversalStatusRequest.php
+++ b/src/Sbp/Requests/Reversal/GetQrcReversalStatusRequest.php
@@ -14,11 +14,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Reversal;
 // <BELIEF_STATE "This POST request requires specific DTOs for its JSON body and its response, along with Saloon's body-handling traits.">
 use Apoloz\AlfaBank\Sbp\Data\Reversal\GetQrcReversalStatusRequestData;
 use Apoloz\AlfaBank\Sbp\Data\Reversal\GetQrcReversalStatusResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -26,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of an SBP reversal, which is a critical operation in payment systems.">
 class GetQrcReversalStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -57,12 +58,14 @@ class GetQrcReversalStatusRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Other fields from the DTO are conditionally added, ensuring the payload precisely matches the API specification.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'GetQRCreversalStatus'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Reversal/QrcReversalRequest.php b/src/Sbp/Requests/Reversal/QrcReversalRequest.php
index 92847d9..1b75bc4 100644
--- a/src/Sbp/Requests/Reversal/QrcReversalRequest.php
+++ b/src/Sbp/Requests/Reversal/QrcReversalRequest.php
@@ -14,11 +14,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Reversal;
 // <BELIEF_STATE "This POST request requires specific DTOs for its JSON body and its response, along with Saloon's body-handling traits.">
 use Apoloz\AlfaBank\Sbp\Data\Reversal\QrcReversalRequestData;
 use Apoloz\AlfaBank\Sbp\Data\Reversal\QrcReversalResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -26,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for initiating an SBP reversal, which is a critical operation in payment systems.">
 class QrcReversalRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Initiating a new transaction or action that changes the system state (like a reversal) is correctly represented by a POST request.">
@@ -57,12 +58,14 @@ class QrcReversalRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Other fields from the DTO are conditionally added, ensuring the payload precisely matches the API specification.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'QRCreversal'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Status/GetQrcStatusRequest.php b/src/Sbp/Requests/Status/GetQrcStatusRequest.php
index 353bd9f..f966928 100644
--- a/src/Sbp/Requests/Status/GetQrcStatusRequest.php
+++ b/src/Sbp/Requests/Status/GetQrcStatusRequest.php
@@ -14,11 +14,12 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Status;
 // <BELIEF_STATE "This POST request requires specific DTOs for its JSON body and its response, along with Saloon's body-handling traits.">
 use Apoloz\AlfaBank\Sbp\Data\Status\GetQrcStatusRequestData;
 use Apoloz\AlfaBank\Sbp\Data\Status\GetQrcStatusResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -26,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of an SBP QR Code, which is crucial for tracking payment flows.">
 class GetQrcStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -57,12 +58,14 @@ class GetQrcStatusRequest extends Request implements HasBody
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. The `TermNo` is mandatory, and `qrcId`, `payrrn`, and `messageID` are optional filters to pinpoint the transaction.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'GetQRCstatus'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Subscription/GetQrSubStatusRequest.php b/src/Sbp/Requests/Subscription/GetQrSubStatusRequest.php
index 74dd176..77926d2 100644
--- a/src/Sbp/Requests/Subscription/GetQrSubStatusRequest.php
+++ b/src/Sbp/Requests/Subscription/GetQrSubStatusRequest.php
@@ -12,20 +12,21 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Subscription;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Sbp\Data\Subscription\GetQrSubStatusResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Http\Response;
+use Saloon\Traits\Body\HasStringBody;
 
-// <BELIEF_STATE "The `Response` object is fully qualified in `createDtoFromResponse` as it is not explicitly imported with a `use` statement at the top. This is acceptable but less explicit.">
-// use Saloon\Http\Response; // Explicit import would be cleaner
 // </SECTION>
 
 // <SECTION name="class_definition" intent="Define the request to get the status of a QR Code subscription.">
 // <BELIEF_STATE "This class encapsulates the logic for querying the status of an SBP subscription, which is crucial for managing recurring payments.">
 class GetQrSubStatusRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Even though it retrieves data, SBP status checks are often performed via POST requests with a JSON body.">
@@ -50,27 +51,27 @@ class GetQrSubStatusRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `GetQrSubStatusResponseData` DTO provides a structured object for the status of the subscription.">
-    public function createDtoFromResponse(\Saloon\Http\Response $response): \Apoloz\AlfaBank\Sbp\Data\Subscription\GetQrSubStatusResponseData
+    public function createDtoFromResponse(Response $response): GetQrSubStatusResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Subscription\GetQrSubStatusResponseData::from($response->json());
+        return GetQrSubStatusResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Other fields are conditionally added, ensuring the payload precisely matches the API specification.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        $body = [
+        $bodyArray = [
             'command' => 'GetQRCSubStatus',
             'TermNo' => $this->TermNo,
             'qrcId' => $this->qrcId,
         ];
 
         if ($this->RQperiod !== null) {
-            $body['RQperiod'] = $this->RQperiod;
+            $bodyArray['RQperiod'] = $this->RQperiod;
         }
 
-        return $body;
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Subscription/QrcSubPayPetitionRequest.php b/src/Sbp/Requests/Subscription/QrcSubPayPetitionRequest.php
index 1dc5347..c4818a4 100644
--- a/src/Sbp/Requests/Subscription/QrcSubPayPetitionRequest.php
+++ b/src/Sbp/Requests/Subscription/QrcSubPayPetitionRequest.php
@@ -12,11 +12,13 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Subscription;
 
 // <SECTION name="module_imports" intent="Import Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
+use Apoloz\AlfaBank\Sbp\Data\Subscription\QrcSubPayPetitionResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -24,7 +26,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for initiating a payment through an SBP subscription, which is a key part of recurring payment flows.">
 class QrcSubPayPetitionRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Initiating a payment action that changes the system state is correctly represented by a POST request.">
@@ -50,23 +52,25 @@ class QrcSubPayPetitionRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `QrcSubPayPetitionResponseData` DTO provides a structured object for the result of the payment petition.">
-    public function createDtoFromResponse(Response $response): \Apoloz\AlfaBank\Sbp\Data\Subscription\QrcSubPayPetitionResponseData
+    public function createDtoFromResponse(Response $response): QrcSubPayPetitionResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Subscription\QrcSubPayPetitionResponseData::from($response->json());
+        return QrcSubPayPetitionResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. All constructor properties are directly mapped to the request body.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return [
+        $bodyArray = [
             'command' => 'QRCSubPayPetition',
             'TermNo' => $this->TermNo,
             'subscriptionToken' => $this->subscriptionToken,
             'SenderMemberId' => $this->SenderMemberId,
             'qrcId' => $this->qrcId,
         ];
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Sbp/Requests/Subscription/RegQrSubRequest.php b/src/Sbp/Requests/Subscription/RegQrSubRequest.php
index d352a36..8a34e7a 100644
--- a/src/Sbp/Requests/Subscription/RegQrSubRequest.php
+++ b/src/Sbp/Requests/Subscription/RegQrSubRequest.php
@@ -13,11 +13,13 @@ namespace Apoloz\AlfaBank\Sbp\Requests\Subscription;
 // <SECTION name="module_imports" intent="Import DTO and Saloon components for a JSON body request.">
 // <BELIEF_STATE "This POST request requires the `RegQrSubRequestData` DTO for its JSON body and utilizes `HasBody` and `HasJsonBody` for proper payload serialization. It currently returns a raw array response.">
 use Apoloz\AlfaBank\Sbp\Data\Subscription\RegQrSubRequestData;
+use Apoloz\AlfaBank\Sbp\Data\Subscription\RegQrSubResponseData;
+use Apoloz\AlfaBank\Utils\CmsSigner;
 use Saloon\Contracts\Body\HasBody;
 use Saloon\Enums\Method;
 use Saloon\Http\Request;
 use Saloon\Http\Response;
-use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Traits\Body\HasStringBody;
 
 // </SECTION>
 
@@ -25,7 +27,7 @@ use Saloon\Traits\Body\HasJsonBody;
 // <BELIEF_STATE "This class encapsulates the logic for initiating an SBP subscription, which is crucial for recurring payment models.">
 class RegQrSubRequest extends Request implements HasBody
 {
-    use HasJsonBody;
+    use HasStringBody;
 
     // <SECTION name="http_method" intent="Declare the HTTP verb.">
     // <BELIEF_STATE "Registering a new resource or initiating an action that changes the system state is correctly represented by a POST request.">
@@ -48,20 +50,22 @@ class RegQrSubRequest extends Request implements HasBody
 
     // <SECTION name="response_caster" intent="Map the JSON response to a DTO.">
     // <BELIEF_STATE "Casting the response to a `RegQrSubResponseData` DTO provides a structured object for the result of the subscription registration.">
-    public function createDtoFromResponse(Response $response): \Apoloz\AlfaBank\Sbp\Data\Subscription\RegQrSubResponseData
+    public function createDtoFromResponse(Response $response): RegQrSubResponseData
     {
-        return \Apoloz\AlfaBank\Sbp\Data\Subscription\RegQrSubResponseData::from($response->json());
+        return RegQrSubResponseData::from($response->json());
     }
     // </SECTION>
 
     // <SECTION name="body_builder" intent="Construct the JSON body for the request.">
     // <BELIEF_STATE "The `command` field specifies the operation to the SBP API. Using the DTO's `toArray` method ensures the payload is correctly structured.">
-    protected function defaultBody(): array
+    protected function defaultBody(): string
     {
-        return array_merge(
+        $bodyArray = array_merge(
             ['command' => 'RegQRcSub'],
             $this->data->toArray()
         );
+
+        return CmsSigner::canonicalize($bodyArray);
     }
     // </SECTION>
 }
diff --git a/src/Services/OpenSslCmsSigner.php b/src/Services/OpenSslCmsSigner.php
index 6d308b7..2141100 100644
--- a/src/Services/OpenSslCmsSigner.php
+++ b/src/Services/OpenSslCmsSigner.php
@@ -55,15 +55,17 @@ class OpenSslCmsSigner implements SignerInterface
         @unlink($inFile);
         @unlink($outFile);
 
-        // Извлекаем Base64 тело подписи согласно примеру из документации Альфы
-        $parts = explode("\n\n", $signedData, 2);
-        if (isset($parts[1])) {
-            $signature = trim($parts[1]);
-            // Удаляем возможные PEM-завершители и переносы строк
-            $signature = str_replace(["-----BEGIN PKCS7-----", "-----END PKCS7-----", "\n", "\r", " "], '', $signature);
-            return $signature;
+        // Надежно извлекаем только Base64 блок подписи из S/MIME или PEM структуры
+        $parts = explode("\n\n", $signedData);
+        foreach ($parts as $part) {
+            // Очищаем часть от пробелов и переносов
+            $cleaned = str_replace(["\n", "\r", ' '], '', $part);
+            // Ищем блок, который выглядит как длинный Base64 (больше 128 символов) и не содержит S/MIME заголовков
+            if (preg_match('/^[a-zA-Z0-9\/+]+=*$/', $cleaned) && strlen($cleaned) > 128) {
+                return $cleaned;
+            }
         }
 
-        throw new SignerException("Failed to extract signature body from CMS container.");
+        throw new SignerException("Failed to extract signature body from CMS container. Output: " . substr($signedData, 0, 100));
     }
 }