Custom integrations are a little trickier than the plug-and-play variety. Here are a few common reasons things go wrong so you can get back on track quickly:
Reason #2: You’re attempting to call the Refersion API from your webpage instead of server side. This should be a back-end process with results showing up on both the back and front ends.
Reason #4: A cart_id is either missing or doesn’t match between clicks and order data sent via webhook.