Pay to become a member (Paypal)

[tilight]

Hello, I am looking for a script that makes you pay to become a member (registered) and uses Paypal since that is the easiest and most used.

Anything like this would do but here are some ideas:

Allow them to pick a username and then they have paid it will send an email with the password.

When they pay it makes their email their username and emails them the password once the payment is received.