StoreKit 2 Subscriptions

Set up auto-renewable subscriptions in a SwiftUI iOS app end-to-end. This skill ships working Swift templates, a local testing config, and a checklist for App Store Connect — so the user can go from zero to a working purchase flow in about an hour.

When to use this skill

Trigger when the user wants to add:

• Auto-renewable subscriptions (monthly, yearly, weekly)
• A paywall or "go premium" screen
• Restore purchases functionality
• Entitlement checks gating premium features

Do not use this skill (yet) for:

• One-time purchases (consumables, non-consumables) — v2
• Server-side receipt validation code — v2 (the skill explains why it matters but doesn't generate server code)
• UIKit projects — SwiftUI only for v1
• Promotional offers or introductory pricing logic — v2

If the user needs any of the above, tell them so and offer the v1 scope as a starting point.

What this skill produces

By the end, the user's project will contain:

YourApp/
├── Subscriptions/
│   ├── SubscriptionManager.swift   (actor: products, purchase, entitlements)
│   ├── TransactionListener.swift   (handles updates from outside the app)
│   └── PaywallView.swift           (SwiftUI paywall, customization marked)
└── Products.storekit               (local config for testing without sandbox)

Plus a checklist of App Store Connect steps they need to do themselves (you can't automate those).

Workflow

Follow these steps in order. Don't skip the interview — getting product IDs wrong is the #1 reason StoreKit setups fail silently.

Step 1: Interview the user

Ask these questions in one batch (not one at a time):

1. App's bundle identifier (e.g., com.example.myapp) — needed for the .storekit config.
2. Subscription tiers: how many, and what are the names? (e.g., "Pro Monthly" and "Pro Yearly")
3. Product IDs they want to use. Recommend the format com.example.myapp.pro.monthly and com.example.myapp.pro.yearly. If they don't have a preference, propose IDs and confirm.
4. Prices for local testing (these are just for the .storekit file; real prices get set in App Store Connect).
5. Subscription group name — all auto-renewable subs must belong to a group. Default: Pro.
6. Where to put the files — confirm Subscriptions/ folder at project root unless they specify.

Step 2: Verify project compatibility

Before generating files, confirm:

• Xcode 15+ and iOS 17+ deployment target (StoreKit 2 features used require this)
• Project is SwiftUI-based (look for @main struct conforming to App, not AppDelegate)
• StoreKit capability will need to be added — flag this for the user

If any of these are missing, tell the user what they need to do before proceeding. Don't generate files into an incompatible project.

Step 3: Generate the templates

Copy these files from templates/ into the user's project, substituting their values:

• templates/SubscriptionManager.swift → Subscriptions/SubscriptionManager.swift
• templates/TransactionListener.swift → Subscriptions/TransactionListener.swift
• templates/PaywallView.swift → Subscriptions/PaywallView.swift
• templates/Products.storekit → project root, with product IDs and prices substituted in

Substitution targets in the templates:

• {{BUNDLE_ID}} → user's bundle identifier
• {{PRODUCT_IDS}} → user's product IDs as a Swift array literal
• {{SUBSCRIPTION_GROUP}} → user's group name

After generating, show the user the diff/files and explain what each one does in one sentence.

Step 4: Wire it into the app

Show the user how to:

1. Instantiate SubscriptionManager as a @StateObject in their App struct
2. Pass it down via .environmentObject(subscriptionManager)
3. Present PaywallView from wherever they gate premium features
4. Check subscriptionManager.hasActiveSubscription to gate content

Give a complete code snippet for the App struct showing all of this.

Step 5: App Store Connect checklist

Read references/app-store-connect-checklist.md and walk the user through it. This is manual work they have to do in the App Store Connect web UI — you can't automate it, but you can list every step in order so they don't miss any. Common miss: forgetting to fill in tax/banking info, which silently blocks all purchases.

Step 6: Testing

Tell the user about the three testing modes (read references/testing-guide.md for details):

1. Local .storekit file — fastest, no Apple account needed, but doesn't test everything
2. Sandbox — real Apple account in TestFlight-like environment, tests most things
3. TestFlight — closest to production, tests everything

Recommend they start with the local .storekit file (which the skill already generated) and graduate to sandbox before launch.

Step 7: Gotchas briefing

Before declaring done, read references/storekit2-gotchas.md and surface the 3 most likely gotchas for this user's setup. Don't dump the whole gotchas doc — pick what's relevant. Examples:

• If they're targeting family-shareable subs, flag the family sharing entitlement check
• If they didn't ask about server validation, briefly explain why they'll eventually want it
• Always mention the "interrupted purchase" case because almost everyone misses it

Reference files

Read these as needed — don't load them all up front.

• references/storekit2-gotchas.md — Edge cases that bite people: interrupted purchases, ask-to-buy, family sharing, currentEntitlements vs all, why server validation matters
• references/app-store-connect-checklist.md — Step-by-step App Store Connect config
• references/testing-guide.md — Local .storekit vs sandbox vs TestFlight

Quality bar

Before declaring done:

• The generated code compiles in a fresh SwiftUI project on Xcode 15+
• The .storekit file loads in Xcode's StoreKit configuration
• A purchase made against the local .storekit config succeeds and hasActiveSubscription flips to true
• The user knows which manual App Store Connect steps remain