Powered by OpenIAP

Expo IAP conforms to the OpenIAP specification — an open, vendor-neutral interoperability standard for in-app purchases across all platforms and frameworks.

What is OpenIAP?

OpenIAP is not just a library — it's a shared specification layer that ensures consistent, secure, and verifiable in-app purchase behavior everywhere. Instead of each framework reinventing its own types, error models, and verification flows, OpenIAP defines them once in a single GraphQL schema and generates type-safe bindings for every platform.

How It Works

GraphQL Schema (Single Source of Truth)
        │
        ▼
   IR (Intermediate Representation)
        │
        ├── Swift bindings    → openiap-apple (StoreKit 2)
        ├── Kotlin bindings   → openiap-google (Play Billing 8.x)
        ├── Dart bindings     → flutter_inapp_purchase
        └── GDScript bindings → godot-iap

What OpenIAP Provides

Component	Description
Shared Specification	Common types, error codes, and purchase flows across all platforms
Generated Type-Safe Bindings	Swift, Kotlin, Dart, and GDScript from a single GraphQL schema
Platform Implementations	openiap-apple (StoreKit 2) and openiap-google (Play Billing 8.x)
Verification Profiles	Standardized receipt validation and purchase verification patterns
Conformance Tests	Cross-platform test matrix ensuring behavioral consistency

Libraries Built on OpenIAP

Library	Platform
react-native-iap	React Native
expo-iap	Expo
flutter_inapp_purchase	Flutter
kmp-iap	Kotlin Multiplatform
godot-iap	Godot Engine

Learn More

• OpenIAP Website — Full specification and documentation
• OpenIAP GitHub — Source code and monorepo
• About OpenIAP — Project overview and vision
• Governance — Open governance model
• Become a Sponsor — Support the standard