iOS 10 : Add sticker extension to an existing Application
If you dont want to use it as a standalone app then you have to use it as a extension in your app.Open File->New->Target and add sticker app extension.Give a name to your sticker pack extension.Also add messages framework in your application.Check in simulator.On device you will be requiring new provisioning profile with the app id corresponding to the sticker pack extension.I have verified at my end