Reply to a request from end-user by API

Reply to a request from end-user by API

Hi,
I want to create custom mobile app for end-user (customer) support. In this scenario, our customer install my custom app and our technician login with SDP. Also I want to chat and conversation with end-user by custom mobile app that connected to SDP API.

I searched for "reply to a request by end-user" in API documentation, but I didn't find it. Also I found ""reply to a request by technician" but I need to this API.


What should I do?

SDP v11.3.03
DB: MS SQL

Thanks for helping