Interfacing my PHP app to an AWS Marketplace Contract

I am interfacing my already completed app written in PHP to Marketplace using a contract. I do not plan to keep their previous membership status in my database. Each time a user logs into AWS I will get another token from aws and then getEntitlement. Is this OK? Not having any php example of how to write the "get token/trade token for an ID/get Entitlement" is frustrating the heck out of me. It is not too hard but having never done it before, means it will be lots of trial and error. I set up a bunch of IAM accounts today to allowlist so I can make multiple attempts.

Was this how most of the apps already setup were done? Or were they native boto3 apps?