How to Reverse Engineer Authentication Keys in Postman

I use Postman for probably more than anything else to get authorization keys. How do you reverse engineer some of that stuff? You just post to the login endpoint and then. Well, of course, everyone's going to follow the most documented proper way first. So if you do have those keys, you can plop them in there. I think somebody was talking about C serve tokens earlier,. There are ways where you can import certificates and cookies.