stripe-react-serverless-7.ts

export const handler = async (
  event: APIGatewayProxyEvent,
  context: any,
  callback: (err: Error | null, data: any) => void,
) => {
  if (!event.body) {
    callback(Error('Invalid body'));
    return;
  }

  const body = JSON.parse(event.body) as IBody;
  const { paymentMethodID, customerID } = body;

  if (!paymentMethodID || !customerID) {
    callback(null, {
      statusCode: 400,
      body: 'Missing payment method or customer',
    });
    return;
  }

  try {
    // Attach the payment method
    await stripe.paymentMethods.attach(paymentMethodID, {
      customer: customerID,
    });

    // Set the payment method as the 'default' for this customer
    await stripe.customers.update(customerID, {
      invoice_settings: {
        default_payment_method: paymentMethodID,
      },
    });

    // Create the subscription
    const subscription = await stripe.subscriptions.create({
      customer: customerID,
      items: [{ price: process.env.STRIPE_PRICE_ID }],
      expand: ['latest_invoice.payment_intent'],
    });

    callback(null, {
      statusCode: 200,
      body: JSON.stringify(subscription),
    });
  } catch (error) {
    callback(error);
  }
};