repair(PayoffRequest): data struct

src/Data/NominalAccounts/Payouts/PayoffRequestData.php

@@ -47,5 +47,10 @@ class PayoffRequestData extends Data
         public ?DataCollection $requisites = null,
         public ?TaxData $tax = null,
     ) {}
+
+    public function toArray(): array
+    {
+        return array_filter(parent::toArray(), fn ($v) => $v !== null);
+    }
     // </SECTION>
 }