The following content is from the Webhooks product documentation. Please refer to the Webhooks documentation if you are unfamiliar with Webhooks.

Webhooks for Pages

Webhooks for Pages can send you real-time notifications of changes to your Pages. For example, you can receive real-time updates whenever users post to your feed, comment on a post, or like your posts.

To set up a Page Webhook:

  1. Set up your endpoint and configure the Webhooks product.
  2. Install your app using your Facebook page.

Setting Up Your Endpoint and Webhook Product

Follow our Getting Started guide to create your endpoint and configure the Webhooks product. During configuration, make sure to choose the Page object and subscribe to one or more of the Pages fields below.

FieldDescription

conversations

Notifies you when a change has occurred in a Page conversation thread.

feed

Notifies you when an Page's feed has changed; posts, likes, shares, etc.

messages

Notifies you when your page has received a messenger update.

Install Your App

Webhook notifications will only be sent if your Page has installed your Webhooks configured-app, and if the Page has not disabled the App platform in its App Settings. To get your Page to install the app, have your app send a POST request to the Page's subscribed_apps edge using the Page's acccess token.

Permissions

The Page's access token with the following permissions:

  • manage_pages

For example, if your Page had the id 145634995501895, you could have your app send a request like this:

Sample Request

curl -i -X POST \
  -d "access_token=page-access-token" \
  "https://graph.facebook.com/v2.11/1353269864728879/subscribed_apps"

Sample Response

{
  "success": "true"
}

To see which app's your Page has installed, send a GET request instead:

Sample Request

GET graph.facebook.com/145634995501895/subscribed_apps

Sample Response

{
  "data": [
    {
      "category": "Business",
      "link": "https://my-clever-domain-name.com/app",
      "name": "My Sample App",
      "id": "145634995501895"
    }
  ]
}

If your Page has not installed any apps, the API will return an empty data set.

Graph API Explorer

If you don't want to install your app programmatically, you can easily do it with the Graph API Explorer instead:

  1. Select your app in the Application dropdown menu. This will return your app's access token.
  2. Click the Get Token dropdown and select Get User Access Token, then choose the manage_pages permission. This will exchange your app token for a User access token with the manage_pages permission granted.
  3. Click Get Token again and select your Page. This will exchange your User access token for a Page access token.
  4. Change the operation method by clicking the GET dropdown menu and selecting POST.
  5. Replace the default me?fields=id,name query with the Page's id followed by /subscribed_apps, then submit the query.

Common Uses

Getting Page Feed Details

Your app can subscribe to a Page's Feed and get notified anytime any Feed-related change occurs. For example, here's a notification sent when a User posted to the 1353269864728879 Page.

Sample Webhook Response

[
  {
    "entry": [
      {
        "changes": [
          {
            "field": "feed",
            "value": {
              "from": {
                "id": "156407155145863",
                "name": "Cinderella Hoover"
              },
              "item": "post",
              "post_id": "1353269864728879_1611108832278313",
              "verb": "add",
              "created_time": 1520544814,
              "is_hidden": false,
              "message": "It's Thursday and I want to eat cake."
            }
          }
        ],
        "id": "1353269864728879",
        "time": 1520544816
      }
    ],
    "object": "page"
  }
]

Use the post_id from the notification to comment on that Page post.

Sample API Request

curl -i -X POST \
  -d "message=I%20want%20chocolate%20cake%20!" \
  -d "access_token=page-access-token" \
  "https://graph.facebook.com/v2.11/1353269864728879_1611108832278313/comments"

Sample API Response

{
  "id": "1611108832278313_1611111875611342"
}

Getting Conversation Details

Your app can subscribe to a Page's conversation and get notified anytime a change occurs in a conversation thread involving your Page. You received a notification that a User sent your Page a message.

Sample Webhook Response

[
  {
    "object": "page",
    "entry": [
      {
        "id": "1353269864728879",
        "time": 1520547127,
        "changes": [
          {
            "value": {
              "page_id": 1353269864728879,
              "thread_id": "t_100023297371310"
              "scoped_thread_key": "t_100023297371315"
            },
            "field": "conversations"
          }
        ]
      }
    ]
  }
]

Use the thread_id to get the user's message.

Starting April 4, 2018, we have a new thread identifier, scoped_thread_key. Both scoped_thread_key and thread_id values will work for all related endpoints. After 90 days, the scoped_thread_id and thread_id values will be the same.

Please see the Changelog for more information.

Sample API Request to View the User's Message

GET graph.facebook.com/t_100023297371310
  ?fields=messages{message}
  &access_token=page-access-token

Sample API Response

{
  "messages": {
    "data": [
      {
        "message": "Hi Ash Cat Page, it's Cinder!",
        "id": "m_mid.$cAASUMsyJZYFoOPEoF1iB6vfi8DvU"
      }
    ]
  }
}

Once you know what the message says, you can reply to it.

Sample API Request to Reply to the User's Message

curl -i -X POST \
  -d "message=Hi%20Cinder%2C%20it's%20Ash%20Cat%20Page!" \
  -d "access_token=page-access-token" \
  "https://graph.facebook.com/v2.11/t_100023297371310/messages"

Sample API Response

{
  "id": "m_mid.$cAASUMsyJZYFoOP0lB1iB7fcj_y8v",
  "uuid": "mid.$cAASUMsyJZYFoOP0lB1iB7fcj_y8v"
}