server.js

import express from 'express';
import fetch from 'node-fetch';
import cors from 'cors';
import 'dotenv/config';
import path from 'path';
const __dirname = path.resolve();

const { CLIENT_ID, APP_SECRET } = process.env;
const base = 'https://api-m.sandbox.paypal.com';
const app = express();
app.use(cors({ origin: '*' }));

const generateAccessToken = async () => {
  try {
    const auth = Buffer.from(CLIENT_ID + ':' + APP_SECRET).toString('base64');
    const response = await fetch(`${base}/v1/oauth2/token`, {
      method: 'post',
      body: 'grant_type=client_credentials',
      headers: {
        Authorization: `Basic ${auth}`,
      },
    });

    const data = await response.json();
    return data.access_token;
  } catch (error) {
    console.error('Failed to generate Access Token:', error);
  }
};

const createOrder = async () => {
  const accessToken = await generateAccessToken();
  const url = `${base}/v2/checkout/orders`;
  const payload = {
    intent: 'CAPTURE',
    purchase_units: [
      {
        amount: {
          currency_code: 'USD',
          value: '0.02',
        },
      },
    ],
  };

  const response = await fetch(url, {
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${accessToken}`,
    },
    method: 'POST',
    body: JSON.stringify(payload),
  });

  return handleResponse(response);
};

const capturePayment = async (orderID) => {
  const accessToken = await generateAccessToken();
  const url = `${base}/v2/checkout/orders/${orderID}/capture`;

  const response = await fetch(url, {
    method: 'post',
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${accessToken}`,
    },
  });

  return handleResponse(response);
};

async function handleResponse(response) {
  if (response.status === 200 || response.status === 201) {
    return response.json();
  }

  const errorMessage = await response.text();
  throw new Error(errorMessage);
}

app.post('/orders', async (req, res) => {
  try {
    const response = await createOrder();
    res.json(response);
  } catch (error) {
    console.error('Failed to create order:', error);
    res.status(500).json({ error: 'Failed to create order.' });
  }
});

app.post('/orders/:orderID/capture', async (req, res) => {
  try {
    const { orderID } = req.params;
    const response = await capturePayment(orderID);
    res.json(response);
  } catch (error) {
    console.error('Failed to create order:', error);
    res.status(500).json({ error: 'Failed to capture order.' });
  }
});

//Serve index.html
app.get('/', (req, res) => {
  res.sendFile(`${__dirname}/index.html`);
});

app.listen(9597, () => {
  console.log('listening on http://localhost:9597/');
});