Hi there @b0sm3r,
Welcome to the Community!
Just to be upfront, the Custom Actions Beta is considered an advanced feature, so our support for it may be more limited. Not because we don't want to help, but because APIs can be tricky to troubleshoot since we can't see what's happening on the other side. Every API that you send a request to is going to have slightly different structures that are required.
This makes it hard for us to know why the request may be receiving errors or not working as expected, beyond taking a general look at what's showing in Zapier.
Here are some helpful resources:
I appreciate your patience and understanding.