Current dialogflow integration is sensible, however it was very tedious for anyone to must become facebook developer and create their own facebook app. While most of the page's owner are not developer and just want to link some of their page to dialogflow
I want to propose that dialogflow should have facebook app with `manage_pages` permission. Have button for oauth with facebook for integration. And just allow user to choose some of their pages to link with dialogflow project. Then all the process in the guideline can be automated. Dialogflow could also config the settings for Webhooks channels it need
I want to comment that this was a very roadblock that I have faced when I try to start integrate facebook. The message was not get to dialogflow properly and I don't know I also need `messaging_postbacks` channel, not only `messages`. If Dialogflow app will manage these for us it will be the far much better integration experience
ps. Please also add label `Dialogflow` and `Dialogflow ES` to the available label
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