A Postback is an action taken by an interactive webpage, when the entire page and its contents are sent to the server for processing some information and then, the server posts the same page back to the browser.
So you need to provide your advertiser with your global postback.
You can find your global postback URL on offer’s edit page - > ‘Postbacks’ section - > ‘Integration pixels’ field:
Or you can also get it on advertiser’s edit page - > ‘S2S’ postback field:
Once you have your postback URL, it needs to be shared with your advertiser.
Notice that you can update postback URL with any available additional parameters according to the guide https://affise.zendesk.com/hc/en-us/articles/209390549-Offers-Integration
Should you need any further assistance, please, contact firstname.lastname@example.org