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Example

Here is a full example of using the Ratio React Native Library in a React Native Application
import * as React from 'react';
import { useEffect, useState } from 'react';
import {
ActivityIndicator,
Alert,
Platform,
SafeAreaView,
StatusBar,
StyleSheet,
Text,
View,
} from 'react-native';
import Web3 from 'web3';
import {
RatioComponent,
RatioOrderStatus,
} from '@ratio.me/ratio-react-native-library';
const styles = StyleSheet.create({
AndroidSafeArea: {
flex: 1,
backgroundColor: 'white',
paddingTop: Platform.OS === 'android' ? StatusBar.currentHeight : 0,
},
buttonWrapper: {
display: 'flex',
alignItems: 'center',
},
buyCryptoButton: {
backgroundColor: 'black',
width: 185,
height: 50,
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
borderRadius: 14,
},
buyText: {
color: 'white',
},
});
const provider ='WEB3_PROVIDER_URL';
const privateKey =
'WALLET_PRIVATE_KEY';
const walletSigningAddress = 'SIGNING_ADDRESS';
const walletDepositAddress = 'DEPOSIT_ADDRESS';
const web3 = new Web3(new Web3.providers.HttpProvider(provider));
export default function App() {
const [loading, setLoading] = React.useState(false);
const [ratioUser, setRatioUser] = useState(null)
const [presetOrder, setPresetOrder] = useState<RatioPresetOrder>(null)
const fetchSessionToken = async () => {
try {
let sessionTokenResponse = await fetch(
'https://your.api.com/clients/session',
{
method: 'POST',
body: JSON.stringify({
signingAddress: walletAddress,
depositAddress: walletAddress,
signingType: "EVM",
}),
}
);
let data = await sessionTokenResponse.json();
return data.id;
} catch (e) {
console.error(e);
}
return null;
};
const redirectUri = () => {
if(Platform.OS === 'ios') {
return 'https://<YOUR-DOMAIN>/plaid/oauth'
}
return null
}
const androidPackageName = () => {
if(Platform.OS === 'android') {
return 'me.ratio.sampleapp'
}
return null
}
return (
<SafeAreaView style={styles.AndroidSafeArea}>
{loading ? <ActivityIndicator /> : null}
<View style={styles.buttonWrapper}>
<RatioComponent
fetchSessionToken={async () => {
return await fetchSessionToken();
}}
signingCallback={async (challenge: string) => {
// if you would like to perform a biometric check, this is where you can place it
let sign = web3.eth.accounts.sign(challenge, privateKey);
return Promise.resolve({
signature: sign.signature,
});
}}
presetOrder={presetOrder}
onPress={() => {
setLoading(true);
}}
onOpen={() => setLoading(false)}
onTransactionComplete={(orderStatus: RatioOrderStatus) => {
Alert.alert(orderStatus.status);
}}
onHelp={() => {
Alert.alert('Help button pressed');
}}
onAccountRecovery={() => {
Alert.alert('Account recovery button pressed');
}}
onError={(errorMessage: string) => {
setLoading(false);
Alert.alert(errorMessage);
}}
onClose={() => {}}
onLogin={(user: RatioUser)=> { setRatioUser(user) }}
redirectUri={redirectUri()}
androidPackageName={androidPackageName()}
>
{/* view used as visible 'button' to press */}
<View style={styles.buyCryptoButton}>
<Text style={styles.buyText}>Buy Crypto</Text>
</View>
</RatioComponent>
</View>
</SafeAreaView>
);
}