Which payment rail
A rail is one way money reaches us: Apple in-app purchase, Google Play Billing,
Entitlements and states
Every rail has its own words for "paid", "cancelled" and "refunded". This page is the
Apple in-app purchase
How an iOS app sells subscriptions and unlocks with StoreKit 2, and how the server
Google Play Billing
How an Android app sells subscriptions and one-time products with Play Billing, and
Stripe
How the website takes subscriptions and one-time payments with Stripe's hosted
Regional gateways
Some markets are served better by a local gateway than by Stripe: local cards, local
Prices, currencies and country
We sell the same plan at different prices in different countries. That makes "which
UPG (our payment gateway)
3 items
Payment mistakes
Every item here really happened while we built payments, mostly in the first six weeks