You would have to onboard your custom API using the sample as a reference. The reference uses GitHub but you should be able to use it as a starting point. You will need to register an end point to subscribe and un-subscribe the weekhook among other things. If there are specific questions, I can help.
Hi My question would be the same as previous. How would i implment this in visual studios. Many of the how-to-tutorials are great, but what it doesn't share are references to doing it in my hown code. Git hub took care of the back end. What do I need to have prepared for me to save the right data? Meaning what to expect to recieve from flow. I might be asking naively.