Multiple WS Receivers for synchronous request

Hello Experts,

I have a requirement to which I need to design the solution.

System: PI 730 ABAP Stack.

There is a web service request that can be sent by multiple systems(A, B, C,D). This request will generate response from ECC (response will be different based on different systems).

The purpose of adding web service interface is that, for all the systems which need to communicate with ECC system for getting the information, they can just call this web service and get information early.

I am thinking of having individual interface for each system. Is my approach correct ?

Could you please suggest the best approach that would cater the requirement. BPM is to be out of scope.

Please let me know if more information needed,

Thanks,

Pankaj