appcoda
This is not technically a "iMessage App Extension" it is a Sticker Pack App
This app is miss titled since it is not technically a "iMessage App Extension" it is a Sticker Pack App.
Sticker pack app. This is a basic sticker pack made up of images or animated images, which you don’t need to use code to build. You can list it in the Stickers category and relevant Stickers subcategories on the App Store for iMessage.
iMessage extension. An iMessage extension can include the same features as a standalone iMessage app, and allow users to access features of your iOS app without leaving Messages. Your iMessage app will be 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 don't wish to be pedantic but I think it would help people who might not be familiar with all the new options to be put into confusion regarding the correct terminology.
