If your account has any Facebook Instant Article channels set up we will append to each send message a comma delimited list of your Facebook Page ID's.

Facebook Instant Articles requires you to claim your website's domain by adding a tag to your page <head> tag containing your Facebook Page ID. You can use the appended id's to keep these id's up to date.
Note that this tags needs to be added to your index page (or even beter, all the pages), since Facebook will crawl your domain in search for it.
More information can be found here in section 'Connect your site'.

 An example can be found below

 <meta property="fb:pages" content="{{ $fbPageIds }}" />

Example of a message with Facebook Page id's

{ 
  "meta":{
      "type":"publish",
      "fb-page-ids":"123456,234567",
      "mac":"8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92"
   }
   "data":{
      ...
   }
}
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