Building a React Native App with Payment Processing

Preparation

Before we dive in, make sure you have a basic understanding of Git, React Native, React, TypeScript, and REST APIs. We’ll also assume you have your environment set up for React Native app development.

Setting Up the Project

Create a new directory named payme and navigate inside it from your terminal. We’ll generate a new Expo app using the following command:

npx expo init payme

Select the second template from the list, which is a blank TypeScript Expo app. This will generate a new app folder named app.

Authentication Page

Create a new file named AuthPage.tsx in the root of the app directory and add the following code:

import React, { useState } from 'eact';
import { View, Text, TextInput, Button } from 'eact-native';

interface AuthProps {
  onLogin: () => void;
}

const AuthPage: React.FC<AuthProps> = ({ onLogin }) => {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');

  const handleLogin = () => {
    // Add login logic here
    onLogin();
  };

  return (
    <View>
      <Text>Login</Text>
      <TextInput
        placeholder="Username"
        value={username}
        onChangeText={(text) => setUsername(text)}
      />
      <TextInput
        placeholder="Password"
        value={password}
        onChangeText={(text) => setPassword(text)}
        secureTextEntry={true}
      />
      <Button title="Login" onPress={handleLogin} />
    </View>
  );
};

export default AuthPage;

This component will handle user authentication, including login.

Product Page

Create a new file named ProductPage.tsx in the root of the app directory and add the following code:

import React from 'eact';
import { View, Text, Button } from 'eact-native';
import Stripe from 'tripe-client';

interface ProductProps {
  product: {
    id: string;
    name: string;
    price: number;
  };
}

const ProductPage: React.FC<ProductProps> = ({ product }) => {
  const handlePayment = async () => {
    // Add payment processing logic here using Stripe
    const stripe = new Stripe('YOUR_STRIPE_SECRET_KEY');
    const paymentMethod = await stripe.paymentMethods.create({
      type: 'card',
      card: {
        number: '4242424242424242',
        exp_month: 12,
        exp_year: 2025,
        cvc: '123',
      },
    });
    // Process payment
  };

  return (
    <View>
      <Text>{product.name}</Text>
      <Text>${product.price}</Text>
      <Button title="Buy Now" onPress={handlePayment} />
    </View>
  );
};

export default ProductPage;

This component will handle product purchases, including payment processing.

Adonis App

We’ll use AdonisJs to build our API server. Create a new directory named api and navigate inside it from your terminal. Initialize a new AdonisJs project using the following command:

npx adonis new api

Follow the prompts to set up the project. We’ll use this API server to handle payment processing and authentication.

• Create API endpoints for user authentication and payment processing
• Implement authentication and payment processing logic using AdonisJs and Stripe

We’ll cover the implementation details of the AdonisJs API server in a future article.