PHP - work with api

We have Saas service. Made a separate version on the second site focused on the United States. This is a demo that should be automatically paid.

In order not to look at the code of the personal account (everything is as complicated as possible there), you need to make a code that will receive requests (there are several types of them) from the LC on the api and send that everything is successfully paid. On the part of the LC everything is done and waiting for you. I will give the key to a clean server and link a domain to it, you will need to install everything.

There is detailed documentation on api in the postman.

PS.: The task is simple, rather for acquaintance. If everything comes together, I will give the billing for alteration, so the stack in which you work is important. And experience.