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

backend/contracts/sendico/models/payment_method/payment_method.yaml

@@ -0,0 +1,29 @@
+components:
+  schemas:
+    PaymentMethod:
+      allOf:
+        - $ref: ../permission_bound.yaml#/components/schemas/PermissionBound
+        - $ref: ../common/describable.yaml#/components/schemas/Describable
+        - type: object
+          additionalProperties: false
+          required:
+            - ownerKind
+            - ownerRef
+            - type
+            - isMain
+          properties:
+            ownerKind:
+              type: string
+              enum:
+                - ACCOUNT
+                - RECIPIENT
+            ownerRef:
+              $ref: ../objectid.yaml#/components/schemas/ObjectId
+            type:
+              $ref: ../../external/payment_method_type.yaml#/components/schemas/PaymentMethodType
+            data:
+              description: Payment-method-type-specific payload. `bankAccount` methods use the same Russian bank-account data shape as `BankAccountEndpoint`.
+              type: object
+              additionalProperties: true
+            isMain:
+              type: boolean