Since the announcement in the WWDC keynote, Ben has been working on a couple of Messages apps, so he and Jelly go through all the ins and outs. Together they look at the super-easy Sticker pack apps, the more complex implementation details for custom apps, and even a few gotchas you might run into while developing.

• Messages API Reference (Apple Developer)
• Messages Apps and Stickers, Part 1 (WWDC 2016)
• Messages Apps and Stickers, Part 2 (WWDC 2016)
• Gifu (GitHub)
• Ice Cream Builder (Apple Developer)

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