I discovered some issues with my webhook yesterday, i've fixed those issues and i was looking for a button to re-launch request to my service.
Finally i've made a request from my computer like zoho does but it will be useful to relaunch a previous request (failed or not) to make test.
Also you can save us time by documenting your internal error code, it's not really easy to find reasons for error messages like {code: 6, message: "Internal Error"}