Improvement: Add Example Webhook Handling Code to Documentation

[crowrooster971]

Description

The current README provides information on how to manage webhooks via the Polar dashboard but does not include specific examples on how to handle incoming webhook events in the Backfeed API. Including a code snippet or example usage would greatly benefit developers looking to implement and respond to webhooks effectively.

Suggested Improvement

• Add a section titled 'Webhook Handling' to the README.
• Include a basic example of how to receive and process a webhook event from Polar in the Backfeed API.
• Documentation could include the necessary libraries, a sample express route, and how to handle the payload.

Example Snippet

app.post('/webhook', (req, res) => {
    const event = req.body;
    switch (event.type) {
        case 'payment.success':
            // Handle successful payment
            break;
        case 'payment.failed':
            // Handle failed payment
            break;
    }
    res.status(200).send('Webhook received');
});

This addition would make it easier for new developers to integrate and utilize the webhook functionality.