Calling a new endpoint

I’m probably not using the correct terminology here but hopefully everyone can see what I’m trying to do.

We’ve created a new endpoint and a new .php file however when trying to call the endpoint we are getting the “page doesn’t exist” error. We know the file being called works, since we changed the ‘woo-wallet’ endpoint to call our new .php file. We just can’t get the new endpoint to call the new .php file. Something simple we are missing?