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

When this project was created, back in 2015, Facebook Webhooks were easy to setup and use. I made this to allow developpers to start a small app from scratch than can do cool stuff, like catching a message posted on a Facebook page, and send it via email, post it to Twitter, or anything you could imagine.

Now, using Facebook Webhooks requires passing through an App Review. IMO, this makes this functionality useful only for pretty big existing Facebook apps.

Consequently I don't think this github project will be useful to anyone, and I will not update it. I keep it for history only.

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