iOS Checkout SDK

import SwiftUI
import WhopCheckout

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(Checkout.shared)
                .task {
                    try? await Checkout.shared.configure(
                        // companyId: find in Dashboard URL (starts with biz_)
                        companyId: "biz_xxxxxxxxxxxxxx",
                        // apiKey: create in Dashboard > Developer with iap:read permission
                        apiKey: "your_api_key_here",
                        planMappings: [
                            .init(whopId: "plan_xxxxx", appleId: "monthly_sub")
                        ]
                    )
                }
        }
    }
}

struct ContentView: View {
    @Environment(Checkout.self) var checkout

    var body: some View {
        if checkout.isSubscribed {
            Text("Welcome, premium user!")
        } else {
            Button("Upgrade to Premium") {
                Task {
                    try? await checkout.purchase("plan_xxxxx")
                }
            }
        }
    }
}