abdullah4ai/subscription-manager

Subscription Manager

Architecture

Single-layer: SubscriptionManager is an @Observable @MainActor singleton that wraps Purchases.shared directly. It holds RevenueCat Package objects — NOT custom plan models.

BANNED Patterns

Do NOT create ANY of these:

• enum SubscriptionPlan / enum SubscriptionTier / struct Plan with price properties
• Models with var price: String returning "$X.XX"
• static let sampleData: [SomePlanType] with hardcoded plans
• ViewModels holding [SubscriptionPlan] or similar custom plan arrays
• Any type that maps product identifiers to dollar amount strings

SubscriptionManager (REQUIRED Pattern)

import Foundation
import RevenueCat

@Observable
@MainActor
final class SubscriptionManager {
    static let shared = SubscriptionManager()

    var isPremium = false
    var packages: [Package] = []     // RevenueCat Package objects ONLY
    var selectedPackage: Package?
    var isLoading = false
    var errorMessage: String?
    var purchaseSuccess = false       // Signals successful purchase for UX feedback

    private init() {}

    func configure() {
        #if DEBUG
        Purchases.logLevel = .debug
        #endif
        Purchases.configure(
            with: Configuration.Builder(withAPIKey: AppConfig.revenueCatAPIKey)
                .with(storeKitVersion: .storeKit2)
                .build()
        )
        Task { await refreshStatus() }
        Task { await listenForChanges() }
    }

    func loadOfferings() async {
        isLoading = true
        defer { isLoading = false }
        do {
            let offerings = try await Purchases.shared.offerings()
            packages = offerings.current?.availablePackages ?? []
            if selectedPackage == nil { selectedPackage = packages.first }
        } catch {
            errorMessage = "Could not load plans."
        }
    }

    func purchase(_ package: Package) async {
        isLoading = true
        defer { isLoading = false }
        do {
            let result = try await Purchases.shared.purchase(package: package)
            if !result.userCancelled {
                isPremium = result.customerInfo.entitlements[AppConfig.entitlementID]?.isActive == true
                if isPremium { purchaseSuccess = true }
            }
        } catch {
            errorMessage = error.localizedDescription
        }
    }

    func resetPurchaseSuccess() {
        purchaseSuccess = false
    }

    func restore() async {
        isLoading = true
        defer { isLoading = false }
        do {
            let info = try await Purchases.shared.restorePurchases()
            isPremium = info.entitlements[AppConfig.entitlementID]?.isActive == true
            if !isPremium { errorMessage = "No active subscriptions found." }
        } catch {
            errorMessage = error.localizedDescription
        }
    }

    private func refreshStatus() async {
        do {
            let info = try await Purchases.shared.customerInfo()
            isPremium = info.entitlements[AppConfig.entitlementID]?.isActive == true
        } catch {}
    }

    private func listenForChanges() async {
        for try await info in Purchases.shared.customerInfoStream {
            isPremium = info.entitlements[AppConfig.entitlementID]?.isActive == true
        }
    }
}

Key points:

• packages is [Package] from RevenueCat — NOT a custom plan array
• purchase() takes a Package — NOT a custom enum
• Prices are NEVER stored in the manager — they come from package.storeProduct.localizedPriceString in the view layer
• Always use AppConfig.entitlementID — never hardcode "premium"

Feature Gating

if SubscriptionManager.shared.isPremium {
    // Premium feature
} else {
    // Show paywall
}

CRITICAL Rules

• ALL pricing data comes from RevenueCat Package objects at runtime
• NEVER put dollar amounts in enums, models, or fallback data
• NEVER hardcode entitlement names — use AppConfig.entitlementID
• If offerings haven't loaded yet, show a loading indicator — not a placeholder price
• Product identifiers come from AppConfig.ProductID constants

Single Owner: SubscriptionManager

SubscriptionManager is the ONLY type that calls Purchases.shared. No other file should import and call Purchases.shared methods.

BANNED:

• PaywallViewModel or any ViewModel that wraps/duplicates SubscriptionManager
• Any View or ViewModel calling Purchases.shared.purchase(), Purchases.shared.offerings(), or Purchases.shared.restorePurchases() directly
• PaywallView must use @State private var manager = SubscriptionManager.shared — not its own ViewModel

Reactive Feature Gating in ViewModels

ViewModels that gate features behind a subscription MUST observe SubscriptionManager.shared.isPremium reactively. Because SubscriptionManager is @Observable, any SwiftUI view or @Observable class that reads isPremium will automatically re-evaluate when subscription status changes (purchase, renewal, expiration, restore).

@Observable
@MainActor
final class SomeFeatureViewModel {
    private let subscriptionManager = SubscriptionManager.shared

    var canAccessFeature: Bool {
        subscriptionManager.isPremium
    }

    var showUpgradePrompt: Bool {
        !subscriptionManager.isPremium
    }
}

Key points:

• Do NOT cache or duplicate isPremium into a local property — always read through SubscriptionManager.shared
• @Observable tracking propagates automatically: when isPremium changes, any computed property reading it triggers view updates
• customerInfoStream in SubscriptionManager handles all external changes (renewals, expirations, family sharing, App Store refunds) — ViewModels do NOT need their own listeners
• Views using @State private var manager = SubscriptionManager.shared also react automatically

BANNED:

• NotificationCenter or Combine publishers for subscription state — use @Observable tracking
• Local var isPremium copies in ViewModels — always read from SubscriptionManager.shared
• Manual Task loops polling Purchases.shared.customerInfo() — the stream handles this

See Model Pattern for why custom tier enums are banned.