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Meta-backed standardized protocol for implementing in-app purchases across all platforms

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# OpenIAP

The standardized protocol for implementing in-app purchases across all platforms

---

OpenIAP is a unified specification for in-app purchases across platforms, frameworks, and emerging technologies.

## Overview

The OpenIAP specification standardizes IAP implementations to reduce fragmentation and enable consistent behavior across all platforms. This is especially critical in the AI coding era where standardized APIs enable better code generation.

## Packages

This monorepo contains all OpenIAP packages:

- **[docs](packages/docs)** - Documentation site at [openiap.dev](https://openiap.dev)
- **[spec](packages/gql)** - OpenIAP specification and type generation [![Spec Release](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fraw.githubusercontent.com%2Fhyodotdev%2Fopeniap%2Fmain%2Fopeniap-versions.json&query=%24.spec&label=version&logo=graphql&color=purple&prefix=v)](https://github.com/hyodotdev/openiap/blob/main/openiap-versions.json)
- **[google](packages/google)** - Android library [![Maven Central (Play)](https://img.shields.io/maven-central/v/io.github.hyochan.openiap/openiap-google?label=Play%20Store)](https://central.sonatype.com/artifact/io.github.hyochan.openiap/openiap-google) [![Maven Central (Horizon)](https://img.shields.io/maven-central/v/io.github.hyochan.openiap/openiap-google-horizon?label=Meta%20Horizon)](https://central.sonatype.com/artifact/io.github.hyochan.openiap/openiap-google-horizon) [![CI](https://github.com/hyodotdev/openiap/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/hyodotdev/openiap/actions/workflows/ci.yml?query=branch%3Amain)
- **[apple](packages/apple)** - iOS/macOS library [![Swift Package](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fraw.githubusercontent.com%2Fhyodotdev%2Fopeniap%2Fmain%2Fopeniap-versions.json&query=%24.apple&label=version&logo=swift&color=orange&prefix=v)](https://github.com/hyodotdev/openiap/releases?q=Apple&expanded=true) [![CocoaPods](https://img.shields.io/cocoapods/v/openiap?color=E35A5F&logo=cocoapods)](https://cocoapods.org/pods/openiap) [![CI](https://github.com/hyodotdev/openiap/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/hyodotdev/openiap/actions/workflows/ci.yml?query=branch%3Amain)
- **[kit](packages/kit)** - Hosted receipt-validation backend (SaaS + dashboard at [kit.openiap.dev](https://kit.openiap.dev)). Free for every developer under hosted fair-use safeguards. [![Kit CI](https://github.com/hyodotdev/openiap/actions/workflows/deploy-kit.yml/badge.svg?branch=main)](https://github.com/hyodotdev/openiap/actions/workflows/deploy-kit.yml?query=branch%3Amain)
- **[mcp-server](packages/mcp-server)** - IAPKit MCP server, hosted at [kit.openiap.dev/mcp](https://kit.openiap.dev/mcp) for AI coding agents

## Libraries

Framework SDK implementations built on top of OpenIAP. These libraries are managed in this monorepo — see [discussion #86](https://github.com/hyodotdev/openiap/discussions/86) for the rationale and migration context.

| Library                                                    | Platform             | Package                                                                                                        | Downloads                                                    |
| ---------------------------------------------------------- | -------------------- | -------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ |
| [expo-iap](libraries/expo-iap)                             | Expo                 | [![expo stable][expo-stable-badge]][expo-npm]                                                                  | [![npm downloads][expo-downloads-badge]][expo-npm]           |
| [react-native-iap](libraries/react-native-iap)             | React Native         | [![rn stable][rn-stable-badge]][rn-npm]                                                                        | [![npm downloads][rn-downloads-badge]][rn-npm]               |
| [flutter_inapp_purchase](libraries/flutter_inapp_purchase) | Flutter              | [![flutter stable][flutter-stable-badge]][flutter-pub]                                                         | [![pub.dev downloads][flutter-downloads-badge]][flutter-pub] |
| [kmp-iap](libraries/kmp-iap)                               | Kotlin Multiplatform | [![kmp stable][kmp-stable-badge]][kmp-maven]                                                                   | —                                                            |
| [maui-iap](libraries/maui-iap)                             | .NET MAUI            | [![maui stable][maui-stable-badge]][maui-nuget]                                                                | [![NuGet downloads][maui-downloads-badge]][maui-nuget]       |
| [godot-iap](libraries/godot-iap)                           | Godot 4.x            | [![godot stable][godot-stable-badge]][godot-releases] [![Godot Asset Library][godot-asset-badge]][godot-asset] | —                                                            |

[expo-stable-badge]: https://img.shields.io/npm/v/expo-iap/latest?label=stable&logo=npm&color=CB3837
[expo-downloads-badge]: https://img.shields.io/npm/dm/expo-iap?label=npm&color=CB3837
[expo-npm]: https://www.npmjs.com/package/expo-iap
[rn-stable-badge]: https://img.shields.io/npm/v/react-native-iap/latest?label=stable&logo=npm&color=CB3837
[rn-downloads-badge]: https://img.shields.io/npm/dm/react-native-iap?label=npm&color=CB3837
[rn-npm]: https://www.npmjs.com/package/react-native-iap
[flutter-stable-badge]: https://img.shields.io/pub/v/flutter_inapp_purchase?label=stable&logo=dart&color=0175C2
[flutter-downloads-badge]: https://img.shields.io/pub/dm/flutter_inapp_purchase?label=downloads&logo=dart&color=0175C2
[flutter-pub]: https://pub.dev/packages/flutter_inapp_purchase
[kmp-stable-badge]: https://img.shields.io/badge/dynamic/xml?label=stable&query=/metadata/versioning/versions/version%5Bnot(contains(.,%22-%22))%5D%5Blast()%5D&url=https%3A%2F%2Frepo1.maven.org%2Fmaven2%2Fio%2Fgithub%2Fhyochan%2Fkmp-iap%2Fmaven-metadata.xml&prefix=v&logo=kotlin&color=7F52FF
[kmp-maven]: https://central.sonatype.com/artifact/io.github.hyochan/kmp-iap
[maui-stable-badge]: https://img.shields.io/nuget/v/OpenIap.Maui?label=stable&logo=nuget&color=004880
[maui-downloads-badge]: https://img.shields.io/nuget/dt/OpenIap.Maui?label=downloads&logo=nuget&color=004880
[maui-nuget]: https://www.nuget.org/packages/OpenIap.Maui
[godot-stable-badge]: https://img.shields.io/github/v/release/hyodotdev/openiap?filter=godot-iap-*&display_name=tag&label=stable&logo=godot-engine&color=478CBF
[godot-releases]: https://github.com/hyodotdev/openiap/releases?q=godot-iap&expanded=true
[godot-asset-badge]: https://img.shields.io/badge/asset_library-godot--iap-478CBF?logo=godotengine
[godot-asset]: https://godotengine.org/asset-library/asset/4627

## Documentation

Visit [openiap.dev](https://openiap.dev) for complete documentation and API reference.

## Community

Have a question or need help? Ask in the relevant [GitHub Discussions](https://github.com/hyodotdev/openiap/discussions) category:

| Library                | Discussion                                                                                |
| ---------------------- | ----------------------------------------------------------------------------------------- |
| openiap-apple          | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/openiap-apple)          |
| openiap-google         | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/openiap-google)         |
| IAPKit                 | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/iapkit)                 |
| expo-iap               | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/expo-iap)               |
| react-native-iap       | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/react-native-iap)       |
| flutter_inapp_purchase | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/flutter_inapp_purchase) |
| kmp-iap                | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/kmp-iap)                |
| maui-iap               | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/maui-iap)               |
| godot-iap              | [Q&A](https://github.com/hyodotdev/openiap/discussions/categories/godot-iap)              |

For bug reports, please [open an issue](https://github.com/hyodotdev/openiap/issues).

## Sponsors

Thank you to our sponsors for supporting the OpenIAP initiative. [Become a sponsor](https://openiap.dev/sponsors)

### OpenCollective Sponsorship

We also recognize sponsors and backers through OpenCollective. The original react-native-iap collective now supports the broader OpenIAP ecosystem and is managed separately from the main sponsor program.

**Sponsors:** <a href="https://opencollective.com/openiap#sponsors" target="_blank"><img src="https://opencollective.com/openiap/sponsors.svg?width=890&cache=20260706" alt="OpenCollective sponsors" /></a>

**Backers:** <a href="https://opencollective.com/openiap#backers" target="_blank"><img src="https://opencollective.com/openiap/backers.svg?width=890&cache=20260706" alt="OpenCollective backers" /></a>

[Become a sponsor](https://opencollective.com/openiap#sponsor) | [Become a backer](https://opencollective.com/openiap#backer)

## Contributing

OpenIAP began with the original [react-native-iap](https://github.com/hyochan/react-native-iap) community and carries that work forward across the broader ecosystem:

See [CONTRIBUTING.md](./CONTRIBUTING.md) for development setup, workflows, and contribution guidelines.

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