what types of apps can onboard ApplePay while already have IAP

I am an IOS developer , and I have been running a mobile app with IOS in-app payment function , while I am considering if I can integrate/ onboard the Apple Pay to allow my users to pay with. I worry about if onboarding Apple Pay will breach any guide line from App Store that I am not aware.

Can you please kinldy reply the guideline for Apple Pay , showing what types or categories of apps that are allowed to use Apple Pay meanwhile having IAP ? I am not sure if I have already got IAP, can I still onboard ApplePay ? thanks