CP-13: Add additional auth data to destination (#61)

api/wallet/spec/definitions/Destination.yaml

@@ -35,6 +35,8 @@ allOf:
           - $ref: "#/definitions/CurrencyID"
       resource:
         $ref: "#/definitions/DestinationResource"
+      additionalAuthData:
+        $ref: "#/definitions/DestinationAuthData"
       metadata:
         description: |
           Some non-transparent for system set of data associated with this destination

api/wallet/spec/definitions/DestinationAuthData.yaml

@@ -0,0 +1,13 @@
+---
+description: Destination auth data to make withdrawals
+type: object
+discriminator: type
+required:
+  - type
+properties:
+  type:
+    description: |
+      The auth data type of the destination.
+    type: string
+    enum:
+      - SenderReceiverDestinationAuthData

api/wallet/spec/definitions/SenderReceiverDestinationAuthData.yaml

@@ -0,0 +1,21 @@
+---
+description: Both sender and receiver auth data refs
+allOf:
+  - $ref: "#/definitions/DestinationAuthData"
+  - type: object
+    required:
+      - senderToken
+      - receiverToken
+    properties:
+      senderToken:
+        description: Token identifying the sender auth data
+        type: string
+        minLength: 1
+        maxLength: 1000
+        example: zu3TcwGI71Bpaaw2XkLWZXlhMdn4zpVzMQg9xMkh
+      receiverToken:
+        description: Token identifying the receiver auth data
+        type: string
+        minLength: 1
+        maxLength: 1000
+        example: zu3TcwGI71Bpaaw2XkLWZXlhMdn4zpVzMQg9xMkh