A computer-implemented method comprising: receiving (S402), by an implementation establishment system and from a request processor, a request message, wherein the request message includes a request method model and a template; in response to receiving the request message: generating (S404), by the implementation establishment system, a simulator module configured to simulate an application programming interface, API; and generating (S406), by the simulator module that has been generated by the implementation establishment system, a client request stub based on the request method model, such that the client request stub is configured to respond to test API calls and API calls relating to the request method model; transmitting (S408), by the implementation establishment system, the client request stub to the request processor; generating (S414), by the implementation establishment system, at least one test API call based on the request method model and the template; transmitting (S416), by the implementation establishment system, the at least one test API call to the client request stub at the request processor; receiving (S420), by the implementation establishment system, at least one response based on the at least one test API call from the client request stub at the request processor; evaluating (S422), by the implementation establishment system, the at least one response; generating (S424), by the implementation establishment system, a response notification based on the at least one response; and transmitting (S426), by the implementation establishment system, the response notification to the request processor. receiving (S402), by an implementation establishment system and from a request processor, a request message, wherein the request message includes a request method model and a template; in response to receiving the request message: generating (S404), by the implementation establishment system, a simulator module configured to simulate an application programming interface, API; and generating (S406), by the simulator module that has been generated by the implementation establishment system, a client request stub based on the request method model, such that the client request stub is configured to respond to test API calls and API calls relating to the request method model; generating (S404), by the implementation establishment system, a simulator module configured to simulate an application programming interface, API; and generating (S406), by the simulator module that has been generated by the implementation establishment system, a client request stub based on the request method model, such that the client request stub is configured to respond to test API calls and API calls relating to the request method model; transmitting (S408), by the implementation establishment system, the client request stub to the request processor; generating (S414), by the implementation establishment system, at least one test API call based on the request method model and the template; transmitting (S416), by the implementation establishment system, the at least one test API call to the client request stub at the request processor; receiving (S420), by the implementation establishment system, at least one response based on the at least one test API call from the client request stub at the request processor; evaluating (S422), by the implementation establishment system, the at least one response; generating (S424), by the implementation establishment system, a response notification based on the at least one response; and transmitting (S426), by the implementation establishment system, the response notification to the request processor. <EOS>