What is Webhooks
For more information, see Wikipedia's page on webhooks.
Webhooks Provider
Create and Manage Webhooks
https://developers.arcgis.com/rest/users-groups-and-items/create-webhooks.htm
https://enterprise.arcgis.com/en/portal/latest/administer/windows/create-and-manage-webhooks.htm
Integration with Webhooks
https://doc.arcgis.com/en/survey123/browser/create-surveys/webhooks.htm
Webhook Receivers
https://github.com/Esri/webhooks-samples
Debugging Tool
Ngrok, https://ngrok.com/
Thanks to Wayne Lee-Archer provide more useful information
Free Sample
As attached.
