Using firebase and react-native components for shopping cart

Step1: Go to the Firebase console (https://console.firebase.google.com/) and create a new project.
Step2: Register your app , select the "Web" option.
Step3: Follow the instructions to register your app, which will involve providing a nickname for your app and registering the app's package name.
Step4: After registering your app, you will be provided with a Firebase configuration object that contains the API keys and other configuration details that you will need to use Firebase in your React Native app.
Step5: To create a Firebase database, click on the "Database" tab in the Firebase console and select the "Realtime Database" option.
Step6: Follow the instructions to set up your database, which will involve selecting a location and setting security rules for your database.
Step7: Once your database is set up, you can use the Firebase SDK for JavaScript to connect to your database from your React Native app.

Sample code to connect to a Firebase database from a React Native app using the Firebase SDK for JavaScript - 

import firebase from 'firebase/app';
import 'firebase/database';

const firebaseConfig = {
  // Your Firebase configuration object goes here
};

firebase.initializeApp(firebaseConfig);

const database = firebase.database();

// Example of how to read data from your database
database.ref('/users').once('value').then((snapshot) => {
  const users = snapshot.val();
  console.log(users);
});

// Example of how to write data to your database
database.ref('/users').push({
  name: 'John Doe',
  email: '[email protected]',
});