You could enable "get request headers" under Advanced Settings and then capture the incoming headers. Then, add a filter right after the webhook trigger where you validate the token/key.

Hi Wes, Is this helpful? The default setting is 1. https://experienceleague.adobe.com/en/docs/workfront-fusion/using/references/scenarios/scenario-execution-cycles-phases#:~:text=Each%20cycle%20represents%20an%20indivisible,The%20default%20number%20is%201.

Could you solve this with Queue Topics? You can associate custom forms with certain Queue Topics. https://experienceleague.adobe.com/en/docs/workfront/using/manage-work/requests/create-and-manage-request-queues/create-queue-topics

Can you post a screenshot of your scenario mapping?

You would have to watch for all documents and then filter based on the folder name or folder ID.