Pass UTMs to Gumroad Product Links

UTM attribution overview Gumroad UTM Tracking Integration only records UTMs that land on the checkout URL at purchase time. UTM Grabber keeps them in cookies on your site. This page explains how to pass that data through before the customer pays. What to expect Gumroad supports custom fields and URL params on product links. Steps Append UTMs from handl_utm to Gumroad URLs Append UTMs with utm-out 
 <a href="https://your-checkout-url.example/product" class="utm-out">Buy now</a> 
 UTM Grabber rewrites the link with cookie values. Details: utm-out class guide . 
 For webhook-based attribution after purchase, see Send Gumroad UTMs via Webhook .