When a customer completes your offer, we need to know as soon as possible so we can deliver the referring merchant’s product. You can use your completion notification URL to do this in one of two ways:

The client-side notification allows you to inform us of offer completions immediately. The server-side notification allows you to inform us later, usually after your customer has left your web site, which can be useful if you are unable to approve offer completions instantly.

Both methods require a click ID, which we generate and send to you at the beginning of each transaction, as well as an HMAC-MD5 hash, which you must generate. We use the click ID to identify the customer and your offer, and we use the hash to validate your notification.