[Card service] Handle payment cancelled & funded events

[mkurapov]

Context

Now that we are sending outgoing payment cancelled & funded events (RAF-1156), we can update how we handle those events in card service.

Depending on the event, we will return a different result for the waiting /payment request (from POS Service).

Todo

• Make sure we return 200 as the status code when we receive the webhook in card service. (Otherwise, the webhook service will fail)

• If we get an outgoing payment cancelled event (with invalid_signature), to the original request from POS service, we should return

  {
      "requestId":"",
      "result": {
          "code": "invalid_signature",
          "description":"Invalid card signature"
      }
  }
  

• If we get an outgoing payment funded event, we should return:

  {
      "requestId":"",
      "result": {
          "code": "approved",
      }
  }
  

• If there was some other error in the request, we should throw a 400 Bad Request with the following:

  {
      "error": {
          "code": "invalid_request",
          "description":"" // some useful debugging information
      }
  }