Apple restricts in app Zaps, because they can't take a cut. So lots of iOS apps don't have zaps in such a way that it's intuitive for us bitcoiners.. Why and how Primal does this differently witht the Apple Guidelines, I don't know exactly. But all other clients are dealing with the same issue. https://9to5mac.com/2023/06/14/apple-damus-app-store-bitcoin/ You can create your own solution to connect a "like" with a "zap" using NWC. Not optimal, but it's something.. https://www.zapplepay.com/ Other clients with Nostr Wallet Connect may be able to solve this similarly, it's already on a lot of places outside the Apple fences: https://nwc.dev/