i have a backend system using PHP to handle transaction. in this case, there is three environment involved. A = client, B = my system, C = payment gateway the scenario is :
what happen now is : every request from client proceed by my system partially, which mean next process will be process when previous request to C has response.
what i want is : even the prevoius request not yet responded by C, my system can receive next request from A and send another request to C.