Changes to Merge the balance of two cards.

the request's body type changed from no type to object

the amount request property type changed from no type to object

the response's body type changed from no type to object for status 200

the response's body type changed from no type to object for status 400

the response's body type changed from no type to object for status 401

the response's body type changed from no type to object for status 403

the response's body type changed from no type to object for status 500

the currentBalance response's property type changed from no type to object for status 200