stripe-react-serverless-10.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 { subscriptionID, end } = body;

  // Note that 'end' can be 'false'.
  // We need to strictly check if it's undefined
  if (!subscriptionID || end === undefined) {
    callback(null, {
      statusCode: 400,
      body: 'Missing subscription id',
    });
    return;
  }

  try {
    // Update the subscription
    const subscription = await stripe.subscriptions.update(subscriptionID, {
      cancel_at_period_end: end,
    });

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