Hi @starkedge, the Webhooks actions from within Developer Accounts will simply send over the JSON representation of a contact, company or deal to the URL when a specific contact, company or deal is updated, created, or deleted. Note - these events are only sent to the webhook URL if the application you set up webhooks for is installed in your account. Normally, people will subscribe to changes on a contact, company or deal, then send the payload to a webhook URL managed by them, format the incoming data to match what the external CRM needs, and then send the newly formatted payload to the external CRM.
The target URL field must be a URL that can receive webhooks. For testing purposes, I use request bin: https://requestbin.fullcontact.com/