X.stickers provides a collection of app extension stickers by X.app for iMessage & FaceTime.
• Setup for iMessage Stickers:
1. Open Messages.app
2. Tap (+) button
3. Select "Stickers" category
4. Select "(X) Stickers".
• Setup for iMessage Camera:
1. Open Messages.app
2. Tap (+) button
3. Select "Camera" category
4. Tap (Star) button
5. Select "(X) Stickers".
• Setup for FaceTime:
1. Open FaceTime.app
2. Start a call
3. Tap (Star) button inside a viewfinder
4. Select "(X) Stickers".