First, create the offer in TUNE. Then in 3DCart, go to Settings > Design > Template editor and click on Edit next to “checkout-step4.html”. Add the following code at the very end:
<iframe src="https://YOUR_NETWORK_ID.go2cloud.org/aff_l?offer_id=OFFER_ID&adv_sub=[invoicenum]&amount=[total]" scrolling="no" frameborder="0" width="1" height="1"></iframe>
Replace “YOUR_NETWORK_ID” with your company network ID, and replace “OFFER_ID” with the ID that corresponds with the offer inside HasOffers. Also included is the sale amount that will get passed back from 3DCart so you can calculate any payouts for CPS offers (if you have this setup for your offer). Also included is the invoice number passed from 3DCart as a reference in the conversion report.
Additional information can be found on the 3DCart support site.