External Purchases (US Web Checkout)
On the US storefront, apps may link out to a web checkout for digital goods using the StoreKit External Purchase Link entitlement — and as of mid-2026, court orders have Apple's commission on those purchases at 0%, with the fee case still moving through district court. This is the largest indie revenue unlock of the era, and it is reversible by a ruling — so the engineering rule is: ship it now, architect it so a commission can be flipped on later.
Verify current state before relying on this: the entitlement terms, the commission rate, and the litigation status have each changed more than once. Treat every number here as "true as of 2026-07, re-check."
When This Skill Activates
- "Add a web checkout / Stripe / external purchase link" for digital goods
- Deciding IAP vs web checkout for a US-heavy revenue base
- The store-growth audit flags P8.4
- Reviewing an app whose external links might be non-compliant (wrong storefront, no entitlement)
The rules of the road
- US storefront only — elsewhere Guideline 3.1.1 still applies (EU/JP/KR have separate entitlements/terms; don't extrapolate from the US).
- Entitlement required:
com.apple.developer.storekit.external-purchase-link+ matchingInfo.plistdeclaration — a bareLink("Buy", …)without it is still a rejection (seeapp-store/rejection-handler§3.1.1). - Present the link per the entitlement's UI terms (StoreKit's
ExternalPurchaseLink/ disclosure sheet where required). Don't dark-pattern the IAP option away if you keep both. - Purchases made on the web are your customer relationship — payment processor, refunds, taxes; Apple's merchant-of-record role no longer applies.
Architecture: the commission flip
Design so that a future "Apple takes N% of external purchases initiated in-app" ruling changes a config value, not your codebase:
- ✅ Route every in-app-initiated web checkout through one link-out service that stamps the
session (
source=app, timestamp, storefront) — web-organic checkouts stay unstamped. If a commission returns, it applies to a knowable, logged subset. - ✅ Keep a single
CommissionPolicy(remote-configurable):rate,applies_to,effective_date. Report/accrue against it from day one — at 0% it's just a counter. - ✅ Log day-one analytics: link taps → checkout starts → completions, vs the IAP funnel. The conversion drop through a web checkout (Apple's sheet, Safari hop, payment form) is real; whether 0% beats IAP's frictionless 85–70% is an empirical per-app question.
- ❌ Scattering
openURL("https://…/buy")calls through features — un-auditable, un-flippable. - ❌ Ripping out StoreKit. Keep IAP as a fallback path (non-US storefronts still need it, and some US users convert better in-sheet).
Decision sketch
Output Format
References
- https://developer.apple.com/documentation/storekit/externalpurchaselink
- https://developer.apple.com/support/storekit-external-entitlement-us/
- https://developer.apple.com/app-store/review/guidelines/#in-app-purchase
- Related skills:
app-store/rejection-handler(the non-entitled rejection pattern),generators/subscription-lifecycle,monetization(pricing),growth/store-growth-audit
