if you want an IOS app to access a web service so that your app users can see shared data of all the users, such as a game and who is leading in the game...current scores of all users, etc.

what do you use? Cloudkitshared? Firebase? AWSAmplify, Vapor?

@VulcanCCIT would like iOS gamers to interact with friends, compare leaderboard ranks, earn achievements, and participate in multiplayer games.

if you want ...your app users to share data of all the users, such as a game and
who is leading in the game...current scores of all users, etc.

This is exactly the point of GameKit. I wonder if you evaluated GameKit, and why it doesn't meet your needs?

If you've not evaluated GameKit, I'd suggest you start by incorporating it first. This way, you'll benefit from Apple's robust, full-featured, time-tested libraries. Plus you'll also sour on the idea of having to build these feature on your own, using Firebase, Vapor, etc.

Keep Coding

See -> GameKit

you know now that you say that I have heard of GameKit but forgot that I heard about it lol I will check that out too! Now if it was not a game, what are most folks using? I guess that is like saying what do most people eat?