After new user logs in or signs up, make a POST call in WordPress

What I am trying to achieve is this: after a user either signs in or signs up on my e-commerce site, I want to trigger a POST call to an endpoint on POSTMAN that will show the data like username, email, password, etc.

I am new to WordPress development so can someone help guide me to where to access the code on WordPress and furthermore make this POST call? Any help is much appreciated!

Also, I am using Woo Commerce if that factors in at all