Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/contracts/sendico/api/payment_methods/request/payment_method.yaml

@@ -0,0 +1,42 @@
+components:
+  schemas:
+    PaymentMethodBaseRequest:
+      type: object
+      additionalProperties: false
+      properties:
+        name:
+          description: Optional human-readable payment method name.
+          type: string
+        description:
+          description: Optional free-form payment method description.
+          type: string
+          nullable: true
+        type:
+          description: Payment method type discriminator.
+          $ref: ../../../external/payment_method_type.yaml#/components/schemas/PaymentMethodType
+        data:
+          description: |
+            Optional payment-method-type-specific payload.
+            For `type: bankAccount`, this uses the Russian bank-account
+            destination shape documented as `BankAccountEndpoint`.
+          type: object
+          additionalProperties: true
+        isMain:
+          description: Optional primary-method flag. When omitted, current handler behavior falls back to `false`.
+          type: boolean
+
+    PaymentMethodCreateRequest:
+      description: |
+        Request payload used to create a payment method.
+        Ownership comes from the route path. The body only carries mutable payment-method fields.
+      required:
+        - type
+      allOf:
+        - $ref: '#/components/schemas/PaymentMethodBaseRequest'
+
+    PaymentMethodUpdateRequest:
+      description: |
+        Request payload used to update a payment method.
+        This is a PATCH contract. Only `name`, `description`, `data`, and `isMain` are mutable.
+      allOf:
+        - $ref: '#/components/schemas/PaymentMethodBaseRequest'