Hope all is well! We have been trying to get a server to server postback in order to passback conversions we see to our OpenX adserver. From what we can summarize, we can generate image pixel and javascript conversion tags but no server to server postbacks. Is there a way to track conversions on both platforms?

Thanks Peter – thought you’d have that data actually? Surely you must (where campaigns are run with both tracking types in place at once) see how many transactions come through each type?

Secondly, I’m assuming that sales value, goal type and order id etc can all be passed back using the postback in the same way? ie this tracking works for CPS campaigns?

An advertiser bust either tie the transaction_id to a user’s account info (user login) or store it in a local cookie. Most ad blockers and browsers block 3rd party cookies and not 1st party cookies (since 1st party cookies have the same domain as the site the user is purchasing from). In fact, you’ll have trouble even using something like gmail if you have all cookies turned off.  This makes server to server more accurate because it does not rely on 3rd party cookies. 

This varies depending on the the website, type of offer, type of traffic, etc. For example, how many customers happen to have cookies totally turned off? Does the advertiser allow sales to occur if the customer has cookies disabled? Some sources say there is a 10-15% discrepancy while others show a much smaller difference. Unfortunately, I have not seen many public tests that put them side by side. Please add them to the comments if you find something more concrete.