User registration based on invitation code

Hi,
I don't know how to explain my needs but I try
First of all. I need to add on a mysql table a list of invite codes.
Second. I need a field on the registration form where user can insert their invite code.
The folowing step I need to check where the invite code match with one of the database and then complete the registration.
I hope that someone help with an advice even it's possible or not what I want.

Thanks

Nobody has an answer?

Professional subscriber incubator project CB Invites can provide this with a few exceptions. It does not use an input field to validate the invite code. What it does is map an email address to the invite code. So if User A invites XYZ then XYZ registers with the email address specified in the invite then it'll accept the invite. You could create a field where the user would supply the invite code and validate it using incubator project CB Redirect before registration completes to send them away, etc..

It would be REALLY nice to be able to generate one-use invitations that automatically expire after use.

Integration with CSSubs would be great so we could protect subscription plans in a more secure way than just hiding it, which seems pretty easy to find once you figure out the url format and know the plan number.