React Native Breez SDK - Nodeless (Liquid Implementation)

The Breez SDK provides developers with a end-to-end solution for integrating self-custodial Lightning payments into their apps and services. It eliminates the need for third parties, simplifies the complexities of Bitcoin and Lightning, and enables seamless onboarding for billions of users to the future of peer-to-peer payments.

What Is the Breez SDK - Nodeless (Liquid Implementation)?

It’s a nodeless integration that offers a self-custodial, end-to-end solution for integrating Lightning payments, utilizing the Liquid Network with on-chain interoperability and third-party fiat on-ramps. Using the SDK you'll able to:

- Send payments via various protocols such as: Bolt11, Bolt12, BIP353, LNURL-Pay, Lightning address, BTC address
- Receive payments via various protocols such as: Bolt11, LNURL-Withdraw, LNURL-Pay, Lightning address, BTC address

Key Features

- [x] Send and receive Lightning payments
- [x] On-chain interoperability
- [x] Complete LNURL functionality
- [x] Multi-app support
- [x] Multi-device support
- [x] Real-time state backup
- [x] Keys are only held by users
- [x] USDT and multi-asset support on Liquid
- [x] Built-in fiat on-ramp
- [x] Free open-source solution

Getting Started

``bash
npm install @breeztech/react-native-breez-sdk-liquid
`
or

`bash
yarn add @breeztech/react-native-breez-sdk-liquid
`

Usage

Head over to the Breez SDK - Nodeless (Liquid Implementation) documentation to start implementing Lightning in your app.

You'll need an API key to use the Breez SDK - Nodeless (Liquid Implementation). To request an API key is free — you just need to complete this simple form.

`ts
import React, { useEffect } from "react"
import {
addEventListener,
connect,
defaultConfig,
LiquidNetwork,
NodeConfigVariant,
prepareSendPayment,
SdkEvent,
sendPayment
} from "@breeztech/react-native-breez-sdk-liquid";
import BuildConfig from "react-native-build-config"

const App = () => (
...

const eventHandler = (sdkEvent: SdkEvent) => {
console.log(${JSON.stringify(sdkEvent)})
}

const payInvoice = async (bolt11: string) => {
// Pay invoice
let prepareSendRes = await prepareSendPayment({ destination: bolt11 })
let sendPaymentRes = await sendPayment({ prepareResponse: prepareSendRes })
}

useEffect(() => {
const asyncFn = async () => {
// Construct the sdk default config
const config = await defaultConfig(LiquidNetwork.MAINNET, BuildConfig.BREEZ_API_KEY)

// Connect to the Breez SDK make it ready to use
await connect({ config, mnemonic })

// Add event handler
await addEventListener(eventHandler)
}

asyncFn()
}, [])

...
)

export default App
`

Example

In the example folder of the Breez SDK repository you will find a basic application for using Breez SDK. Change directory into the folder and install the dependencies:
`bash
yarn
`
Then to run on android:
`bash
yarn android
`
or for iOS:
`bash
yarn pods && yarn ios
`

Troubleshooting

$3

If your project uses a React Native version less < 0.71.0, and you want to build your app for Android, you might run into an error like this:

`
2 files found with path 'lib/arm64-v8a/libc++_shared.so' from inputs:
- /(...)/.gradle/caches/transforms-3/c476ede63d070b991438fe0d1c323931/transformed/jetified-react-native-0.68.6/jni/arm64-v8a/libc++_shared.so
- /(...)/.gradle/caches/transforms-3/7c318ac8dd87c1f0c7540616d6d47bd8/transformed/jetified-breez-sdk-0.1.3/jni/arm64-v8a/libc++_shared.so
`

To fix this you need to disambiguate which file to use by adding the following snippet to your app's android/app/build.gradle:

`gradle
android {
// ...
packagingOptions {
pickFirst 'lib/x86/libc++_shared.so'
pickFirst 'lib/x86_64/libc++_shared.so'
pickFirst 'lib/armeabi-v7a/libc++_shared.so'
pickFirst 'lib/arm64-v8a/libc++_shared.so'
}
}
`

Both the Breez SDK as well as React Native package the libc++_shared.so` native library.
React Native versions below 0.71.0 have a bug where they cannot automatically handle multiple versions of this file.
This has been fixed in React Native 0.71.0 and thus the above snippet only needs to be added to projects using React Native < 0.71.0.