Overview
ClickBank recently made an update to the PostbackPixel external click parameter changing it from:
{ext_clid} → {extclid}
While a backwards compatibility mechanism is in place, we’ve seen a very small number of cases where it's not functioning as expected. If you've noticed any recent issues with tracking conversions, especially through Custom PostbackPixel S2S reporting, this may be the reason.
Next Steps
If you (or your clients) are using Custom PostbackPixel S2S configurations, we recommend updating any instances of {ext_clid} to the new {extclid} macro as a precaution.
Good news: If you're using PostbackPixel to send data directly to ad platforms like Google Ads or Facebook Ads, you don’t need to make any changes—those setups are not affected.