How to integrate the api of openapi to my business system?

User → AI → My business system

I want to integrate openai to my business system.

We already know AI easier to understand human language, I want to use openai to communicate with my end-user. then openai like the bridge between end-user and our business system.

but I don’t know how to do .

End-user → un-structure data ->openai → structure data → api of our business system → structure data → openai → un-structure data → End-user ??

do you have any idea?