Handling application/x-www-form-urlencoded posts

This post helped me. Azure Functions can support 3 types of webhooks

1. Generic JSON
2. GitHub
3. Slack

functions.json file responsible for bindings can be manipulated directly

{
  "bindings": [
    {
      "type": "httpTrigger",
      "direction": "in",
      "webHookType": "genericJson",
      "name": "req"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "res"
    }
  ],
  "disabled": false
}

or via UI