To be clear, I already know how to create a standalone sticker pack and submit it through Xcode. I need to know the procedure for creating and submitting a "Sticker App Extension" using Xcode or iTunesConnect or both. For clarification, here is Apple's description of a Sticker App Extension:
"Sticker pack extension. You can bundle a sticker pack with your iOS app. The sticker pack is listed on the App Store for iMessage in the same category and with the same description as your iOS app on the App Store."
I want my app to work like Crossy Road. If you download the Crossy road app, the Crossy Road sticker pack is automatically downloaded with it. If you download the Crossy Road sticker pack, the Crossy Road app is automatically downloaded with it.
Can someone show me where I can find instructions on how to tie my app to a sticker pack in this way?