checkout.js

const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);

/*
 * Next available dates loaded from some database
 */
const calendar = require('./data/calendar.json');

exports.handler = async (event) => {
  const nextDates = getNextDates(calendar)
  const { startDate, endDate } = nextDates;
  const session = await stripe.checkout.sessions.create({
    mode: 'payment',

    /*
     * This env var is set by Netlify and inserts the live site URL. If you want
     * to use a different URL, you can hard-code it here or check out the
     * other environment variables Netlify exposes:
     * https://docs.netlify.com/configure-builds/environment-variables/
     */
    success_url: `${process.env.URL}/success.html`,
    cancel_url: process.env.URL,
    line_items: [
      {
        price_data: {
          currency: 'cad',
          unit_amount: 100000, // in cents
          product_data: {
            name: 'Product Coaching',
            description: dateDescription(nextDates),
          },
        },
        quantity: 1,
      },
    ],
    // We are using the metadata to track which items were purchased.
    // We can access this meatadata in our webhook handler to then handle
    // the fulfillment process.
    // In a real application you would track this in an order object in your database.
    metadata: {
      start_date: startDate,
      end_date: endDate
    },
  });
}