When you make an iMessage sticker application is it possible to have it make a sound once its tapped on? Example: You sent someone a sticker and they tap on it and it makes a noise. Thank you
Yes you can with iMessage. As per Apple documentation here.
iMessage Application
iMessage app. Your app can include stickers, text, video and audio. You can also use code to add functionality such as Apple Pay and in-app purchase. Choose to list your app in the Stickers category or another relevant category on the App Store for iMessage.