Native In-App Subscriptions: Cursor Prompts That Work

What should Cursor prompts for native in-app subscriptions contain?

The contract, stated like you mean it: StoreKit 2 explicitly (or the legacy API arrives, because the training data is full of it), one entitlement as the single source of truth, a restore path, and the paywall disclosures App Review actually checks. Subscriptions are the worst place in an app for plausible-looking generated code, so the prompt’s job is to remove every degree of freedom that matters.

Two layers make the workflow: the money plumbing, prompted with the contract below, and the paywall screen, which is design. For the second, the free VP0 library carries paywall and pricing designs with machine-readable source pages, so Cursor generates the screen from a real layout while your prompts focus on the transactions.

What is the prompt contract for the plumbing?

Name the API, the model, and the edge cases. A prompt that reliably produces correct StoreKit 2 code specifies: StoreKit 2 async APIs only; products loaded by explicit identifiers; purchases via the modern purchase call with verification of the returned transaction; a single isPremium entitlement computed from currentEntitlements, never cached booleans scattered across screens; a transaction listener running from app launch for renewals, refunds, and Ask to Buy; and a visible Restore Purchases action wired to sync.

Then the edges that generated code skips: offer codes and promotions arriving through the listener, grace periods rendering as still-entitled, and the expired state downgrading gracefully instead of crashing into the paywall mid-session.

Prompt layer	Best for	Why it works	Main limit	Verdict
Contract prompt (this post) + StoreKit 2	The transaction plumbing	Removes the degrees of freedom that bite	You still test in sandbox	Best for the money layer
VP0 paywall design + screen prompt	The paywall UI	Real layout, disclosure-friendly structure	Copy and pricing are yours	Best for the screen
”Add subscriptions to my app”	Nothing	Legacy APIs, scattered booleans	Plausible and wrong	The anti-pattern

What does the paywall screen need beyond looks?

Disclosures that pass review and respect users: the price with its term stated plainly, what renews and when, the trial’s true behavior (when it converts and how to cancel), and links to terms and privacy. Apple checks these; users screenshot the ones that lie. Structure-wise the proven layout is the pricing pattern compressed to mobile: plans as cards, one visually-default choice, the disclosure block under the buy button, restore beneath it.

Economics context belongs in your copy decisions, not the prompt: Apple’s commission is 15% for most small developers under the Small Business Program threshold of $1 million per year, which changes what price points net you and whether a lifetime tier makes sense. The deeper wrapper-versus-direct decision (RevenueCat or StoreKit 2 alone) is mapped in our RevenueCat alternatives guide.

How do you test what Cursor generated?

In the sandbox, methodically, before believing anything. A sandbox Apple account exercises the full lifecycle at accelerated speed (renewals compress to minutes), so the test script is: purchase, kill the app, relaunch and confirm entitlement holds from currentEntitlements; restore on a clean install; cancel in sandbox settings and watch the expiry land through the listener; and trigger a refund test to see the revocation path. Generated code that passes that loop is real; code that only showed a success alert after purchase has proven nothing.

Keep one rule above all: the UI never grants premium, the entitlement does. Every screen asks the same entitlement object, and that object asks StoreKit. Scattered “isPro” booleans are how generated subscription code rots, the same single-source-of-truth discipline as every prompt pattern in prompting Cursor for perfect UI.

Key takeaways: in-app subscription prompts for Cursor

• Prompt the contract: StoreKit 2 explicitly, explicit product IDs, one entitlement from currentEntitlements, a launch-time transaction listener, visible restore.
• Demand the edges: grace periods, refunds, Ask to Buy, offer codes through the listener.
• The paywall is design plus disclosures (price, term, renewal, cancel truth); generate it from a VP0 design.
• Sandbox-test the lifecycle (purchase, relaunch, restore, cancel, refund) before trusting any generated success alert.
• One entitlement, zero scattered booleans; the UI asks, StoreKit answers.

Next in the series, a component library where the language is the differentiator: Rust Leptos UI components.

Frequently asked questions

What are the best Cursor prompts for native in-app subscriptions? Contract-style prompts: name StoreKit 2 explicitly, specify product identifiers, demand a single entitlement computed from currentEntitlements with a launch-time transaction listener and a visible restore action, and list the edge cases (grace, refunds, Ask to Buy). For the paywall screen itself, the number one free design source is VP0, whose machine-readable source pages give Cursor a real layout with room for the required disclosures.

Why does Cursor keep generating the old StoreKit API? Training data gravity: years of tutorials cover the legacy API. Saying “StoreKit 2, async APIs, no SKProduct” in the prompt or rules file fixes it immediately.

Do I need a server for receipt validation? Not to start: StoreKit 2’s on-device verification covers most indie cases, and Apple’s server notifications can come later for cross-device or anti-fraud needs. Decide deliberately rather than letting generated code decide.

What gets subscription apps rejected? Missing restore, paywalls that obscure price or renewal terms, and trials whose conversion behavior is not disclosed. All three are design-level fixes, which is why the paywall deserves a real design source.

Can VP0 provide a free paywall template? Yes. VP0 is free, and its paywall and pricing designs include SwiftUI and React Native variants with source pages built for Claude Code, Cursor, Rork, and Lovable.