Of course anything is possible, but those features would need to be custom written.

The script already counts outbound clicks, so you could perhaps, create a new mysql table to keep track of pre-purchased and unpaid clicks.

Credit card transactions are particularly involved and I'm afraid there are limits to how much help I can give for free on these forums. If you are unfmailiar with that type of programming, I'm afraid I can really only suggest outsourcing portions of the project.

Possibly there is another free/open source script out there that is closer to meeting your needs, but I'm not familiar with one.