# Webhooks

You can register your webhooks and view the requests we made to them in Developer -> Webhooks.

<figure><img src="https://1499671166-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fda0CPvFjFKQsHDL5o9xa%2Fuploads%2FSnGbm4nxEjvHOBcxUeLx%2FScreenshot%202023-12-21%20at%2013.52.51.png?alt=media&#x26;token=30a9ea42-ecd9-4cc1-b6db-202a3324aeb2" alt=""><figcaption><p>Example of a registered webhook for a Custom Reward</p></figcaption></figure>

Webhook are great tools for setting up integrantions with your app using webhook quests and custom rewards.

{% content-ref url="../campaign-managers/quests/webhook-quests" %}
[webhook-quests](https://docs.thx.network/campaign-managers/quests/webhook-quests)
{% endcontent-ref %}

{% content-ref url="../campaign-managers/rewards/custom-rewards" %}
[custom-rewards](https://docs.thx.network/campaign-managers/rewards/custom-rewards)
{% endcontent-ref %}

### Example Webhook

This is an example implementation of a webhook for a NodeJS express server.

```javascript

// Helper method to verify payload signature
function constructEvent(payload, signature, secret) {
	const hmac = crypto.createHmac('sha256', secret);
	hmac.update(payload);
    const calculatedSignature = hmac.digest('base64');
	if (signature !== calculatedSignature) throw new Error('Failed signature verification')
    return JSON.parse(payload);
}

// Sample endpoint controller (Express)
app.post('${path}', (req, res) => {
    let event;

    try {
        // Veries and parses the payload using the WEBHOOK_SIGNING_SECRET which you can get in Developer -> Webhooks
        event = constructEvent(req.body.payload, req.body.signature, WEBHOOK_SIGNING_SECRET);
    } catch (error) {
        return res.status(400).send("Webhook Error: " + err.message);
    }

    switch(event.type) {
        case 'reward_custom.paid': {
            // Handle the event
            // ...
            break
        }
        default : {
            console.log("Unhandled event type " + event.type)
        }
    }

    res.send();
});`;
```