MVP Billing Playbook: In‑App Purchase, Subscription, or External Checkout for Your First 1,000 Paying Users

Start with a single question: are you selling digital goods or services consumed inside the mobile app? If yes, platform rules may require platform billing; if your primary value is outside the app or you’re a reader/service that qualifies for exceptions, you may be able to use external checkout. Platform policy details matter and are summarized below. (developer.apple.com)

Business tradeoffs fall into four concrete buckets: conversion, fees, refunds/chargebacks, and product control. In general: IAP improves conversion inside the app (native flows, saved payment), but costs more in platform commissions and limits price flexibility; external checkout gives you full control over pricing, trials, and refunds but adds friction in mobile flows and increases engineering and support responsibility. Use this mapping to prioritize: when speed-to-revenue matters and you can accept commissions, prefer IAP; when maximizing LTV and price experimentation matters, prefer external checkout. (stripe.com)

Apple and Google each publish developer policies that can force your billing choice. Apple’s App Review rules and the External Link/Reader entitlements let some apps point users to external sign-up pages under narrow conditions and with implementation requirements. Google Play requires Play Billing for in‑app purchases of digital goods unless you meet an allowed exception. Misreading these policies is one of the fastest ways to get rejected in review — or to build a flow that’s later disallowed. (developer.apple.com)

Policy nuance matters: some ‘reader’ apps can use the StoreKit External Link Account entitlement or link to external sign-up pages, but the entitlement has eligibility and technical requirements and may not apply to all apps. Google has similar exceptions but enforces Play Billing for most digital goods consumed in-app. Before committing, map every paid feature to: (a) digital vs physical/real-world service, and (b) whether the value is delivered inside the app. When in doubt, assume the platform will require platform billing. (developer.apple.com)

Before building a subscription engine, run low-friction experiments to measure conversion, price sensitivity, and refund risk. These experiments prioritize speed and data over engineering completeness — you’re validating demand, not launching a fully compliant app store integration yet. Use metrics like click-to-pay conversion, paid activation rate, trial-to-paid conversion, and refund requests per 100 customers.

Six experiments that scale from no-code to minimal engineering: 1) Preorder / waitlist landing page with price and call-to-action; 2) Stripe Checkout 'Buy' button in a marketing webview (hosted checkout); 3) Manual invoice / sales call for higher‑touch plans; 4) Promo codes on a closed-beta sign-up page to test price sensitivity; 5) Lightweight native paywall that links to external checkout (if policy allows) to measure mobile drop-off; 6) Prototype with platform IAP sandbox purchases for an internal cohort to compare conversion. Each experiment reveals different signals; combine them rather than relying on one. (stripe.com)

When you choose native IAP, treat the implementation as both engineering and product work. Required items: implement platform SDK (StoreKit on iOS, Play Billing on Android), add paywall UI with clear restore/purchase flows, support receipt validation (server-side recommended), and record metrics that map IAP events to your user model (who converted, where they came from, lifetime metrics). Apple’s App Review cares about accurate metadata and flows — prepare review notes and test accounts. (developer.apple.com)

Operational checklist: plan for platform commission on your unit economics, decide refund policy that matches platform rules, instrument subscription lifecycle hooks for churn and dunning, and build a lightweight customer support playbook for purchase issues (restores, refunds, subscription changes). If you expect to scale pricing tests, prepare a product roadmap for staged A/B tests while respecting platform rules for price changes and subscription upgrades/downgrades. (stripe.com)

If policy and product allow external checkout, use a hosted, PCI-compliant solution like Stripe Checkout or a lightweight payment link. Benefits: instant price experimentation, couponing, multiple payment methods, and direct control of refunds and billing. Tradeoffs: higher mobile drop-off when you send users to the browser and responsibility for dispute resolution and payments security. Use Stripe-hosted pages or 'Link' to accelerate conversion and manual fallbacks for failed flows. (stripe.com)

Operational checklist: ensure clear in-app messaging to meet any platform disclosure rules, implement robust server-side account linking (so web purchases unlock app features securely), prepare refund and chargeback workflows in your support docs, and localize pricing where possible to reduce payment friction and FX surprises. Track same metrics as IAP experiments so you can compare conversion and LTV. (docs.stripe.com)