The Messenger Expressions API is being deprecated and will stop functioning on August 1st, 2018. For information on sharing to Facebook Messenger, see Sharing to Messenger.
Learn more about the different ways you can integrate with Messenger in our Platform Overview.
Once you've finished your implementation, ship your app to the Apple App Store or Google Play.
After you've integrated optimized sharing, you'll need to submit for App Review to enable Install and Reply links delivered with the content shared from your app in Messenger.
Basics on how you can build Messenger into your app. Includes best practices on building apps that feature optimized sharing to Messenger.
Submit your app for review to enable the Install and Reply buttons when your content is shared via Messenger.
See apps that have integrated with Messenger Platform.