Hi Damon. The Webhooks Add-On feed will be processed after successful form submission, not after every page transition in a multi-page form.
If you want to process the Webhooks feed after every page transition, you can use the Partial Entries Add-On. When using that add-on, a partial entry will be created (or updated) with each page transition or based on the WordPress heartbeat. Here’s how it works:
When using the Partial Entries Add-On, you have access to two new hooks: gform_partialentries_post_entry_saved gform_partialentries_post_entry_updated
Based on the documentation here:
The documentation shows processing various feeds when a partial entry is updated. I believe that is what you want to do. If you need anything else, please let us know.