MVC5 API Endpoint / Routing


I seem to be unable to add a custom end point.

I have created my API site and tried to add my endpoint, I’m using MVC but the app seems to enable the web services and ‘accept’ it - Yet when I click test integration, it seems to fail all the time?

I can see it firing through my logs, but its unable to pick up the messages etc

To confirm, does my endpoint need to be: https:/// or https:///smssync

Anyone had any luck with MVC and can provide assistance?