I have been trying now for several days to get webhooks integration working with a test portal. When I go through the oAuth process I get to the grant page and get a code querystring parameter back. When I submit that to /oauth/v1/token I get an HTTP 500 error with no message or response body.
My redirect_uri points to our development servers at https://app7-preview.ccrmdev.com/Integrations.aspx.
I am at loss at this point.
Any help would be greatly appreciated.