Epicor P21 to Website API Documentation

Hi there! I am helping a client create a bridge from their eComm site (done in PHP/ExpressionEngine) to their P21 implementation, to help with managing inventory and shipping and all of that. I have been looking for composer packages or some sort of code that gives examples of this, but can’t find any. I also can’t find any documentation re: the P21 API for authentication or endpoints or anything.

Where is the best place to start with all of this? Or does anyone have a basic P21 API implementation that they could share (regardless of language)?

Did you ever find documentation or an example on this @dougblackjr

EDIT: Should have refined my Google search a little more, found this

https://erpcustomer.epicor.com/downloads/prophet21/common/Current%20Release%20Downloads/Current%20Build%20Release/Middleware/API%20Getting%20Started.pdf

I know this is now 2 years old but I have a node implementation that gets an access token and make a request to two entity rest apis, if that would help

Matt, we’re looking into fashioning just such a thing. Can you share a bit about your experience making those entity requests?