Subscribe Facebook page to external app

问题

I have a webapplication where brands have a feed and can post things. I want to make them be able to, whenever they post something on their Facebook page, it becomes posted in the feed of my webapp.

I know I have to use the webhooks and all that. So far, I have tried this:

1. I have created my own app in Facebook.
2. I created a Facebook page (with that same account).
3. I created the webhook.
4. I added my app to my page's subscribed apps.
5. I post something on my page, and it works.

Now, let's say there is Coca Cola, that has a Facebook page.

Is it possible to add my app to Coca Cola page's subcribed apps?

来源：https://stackoverflow.com/questions/41877621/subscribe-facebook-page-to-external-app