The referral happening is just an action - so a SaaS company using it could easily provide credit, as with Dropbox. You could provide a callback URL for us to notify you when the referral happens, but we handle all the tracking, url generation, analytics, split testing, etc. Check out the custom integration instructions: http://www.curebit.com/integration#custom
Some of our stores (mypuppypads.com) delay the offer by a week - giving their customers a chance to first try the product.
In other cases, like when Six Orange Grove runs a Charlie's Soap deal (these always go super viral), there's no need to delay the offer. The people that buy & share are die-hard Charlie's Soap fans that stockpile it whenever it goes on sale: http://twitter.com/#!/kakaty/statuses/4377656799793152 http://twitter.com/#!/myfirstkitchen/statuses/43714330105036...