WebProNews.com has a new article for anyone out there that's currectly using a Citibank account and wants to ensure that keeps potential processing errors from occurring.

From Clickbank Security Using PHP, they show you how to, using the tools already in place with Citibank, create a page that only responds to a seed value and a hash of the seed and your secret key. Then, no one can just create the link to the final page unless it directly corresponds to a current transaction. Then, with their "cbpop" (Citibank Proof of Purchase), you know that the sale is 100% legit.

Using it to protect the products you sell with Clickbank, using their built-in protection and by implementing a 30-day expiration, all without having to worry about managing databases or customer lists.