Need promo code ability for subscriptions.

[ajhalls]

Need promo code ability for subscriptions.
Good afternoon, I have a site that streams videos for pre-med students. We just released a subscription service which is working under paypal ( a few glitches with it) but would love to give all of ASU pre-med students free access to the subscription content. Is there a way for me to give ASU a list of codes (single use, or repeat use) that would allow me to give them access and preferably also be able to do something like a 3 day sale type thing.

Can I do this on Vbulletin at all? Can I use Paypal or do I need Authorize.net? Any other ideas you feel like throwing out...