I never got a successful response. Even with authentication and valid input data, I received 400 responses only.

[RogerBarreto]

Due to the initial random nature of the AcquiringBankMock API return randomized responses, the success of a payment will not be always achieved.
Will elaborate better a solution to allow combined conditions that will always garantee a same result to help integration testing.

This approach will be done with the next major change to the solution

[RogerBarreto]

The creation of a UnitTest and Integration test to the solution may solve this problem