Ap world test

I took the ap world test today and after finishing and turning it it in, I found out I did not pay for it. Am I still able to pay for my test or is it invalid or cancelled now?

In my experience with AP course ( in school and online) you dont have to pay for it. If you take it online you only have to order it, and if you take in school you register and they order it for you. So it shouldn’t effect your scores at all :-*