This project is a sample code to show how to use Facebook WebHooks with ASP.Net Core Web API.

Whenever something happen on your Facebook Page, Facebook will send a request to your server. (visit https://developers.facebook.com/docs/graph-api/webhooks to know more about Facebook Webhooks)

This Web Application catch this request and do something accordingly. For now, it just sends a mail with the changes.

• Visual Studio 2017 (Community Version is downloadable for free)
• An Azure Account (get an evaluation account for free : https://account.windowsazure.com )
• A Facebook Application (you can create one for free : https://developers.facebook.com/ )
• You must be Admin of a page on Facebook

• Open the solution in Visual Studio
• Edit the configurations in appsettings.json
• Validate the configuration by Right clicking on wwwroot/test.html, show in browser, and do some basic tests
• Right-click on the project, "Publish..." and select your azure account.

Note : This app has been tested with Facebook Webhooks v2.10

• Go to the Dashboard of your Facebook Application : https://developers.facebook.com/apps/
• Click the Webhooks menu
• New Subscription > Page
• Callback Url : https://yourdomain.com/api/webhooks
• Verify Token : The same one as in appsettings.json
• Subscriptions Fields : Select the fields you're interested in

• Open the Graph API Explorer : https://developers.facebook.com/tools/explorer/
• On the top right Combo Box, select your Application
• Just below, in the Token ComboBox, select your Page.
• Select the verb POST for the request
• Enter the path : {your-page-id}/subscribed_apps
• Submit : you should get a success.

From now on, every time a new status or photo is posted on your page, you will get an email.

Feel free to adapt this application to any scenario you can imagine. Like :

• When I post something on Facebook, create a new blog post on my Drupal / Wordpress website.
• When I add a photo to Facebook, put it on tumbler too.
• ...

• More tests for various potential events