# Attentive Webhooks

## When to Use This Skill

* How do I receive Attentive webhooks?
* How do I verify Attentive webhook signatures?
* Why is my `x-attentive-hmac-sha256` signature verification failing?
* How do I handle `sms.subscribed`, `sms.unsubscribed`, or `email.opened` events?
* Understanding Attentive event types and payloads

## Verification (core)

Attentive signs the raw request body with HMAC-SHA256 keyed on your
per-webhook signing key (called the "client secret" in the dashboard) and
sends the digest, hex-encoded, in the `x-attentive-hmac-sha256` header.
There is no timestamp in the signature (Attentive does not use the Standard
Webhooks scheme), so compute the HMAC over the exact raw body and compare
timing-safe. There is no official server-side SDK, so verify manually.

Node:

```javascript
const crypto = require('crypto');

function verifyAttentiveWebhook(rawBody, signatureHeader, secret) {
  if (!signatureHeader) return false;
  const expected = crypto.createHmac('sha256', secret).update(rawBody).digest('hex');
  try {
    return crypto.timingSafeEqual(
      Buffer.from(signatureHeader, 'hex'),
      Buffer.from(expected, 'hex')
    );
  } catch {
    return false; // wrong length / non-hex input
  }
}

```

Python:

```python
import hmac, hashlib

def verify_attentive_webhook(raw_body: bytes, signature_header: str, secret: str) -> bool:
    if not signature_header:
        return False
    expected = hmac.new(secret.encode("utf-8"), raw_body, hashlib.sha256).hexdigest()
    return hmac.compare_digest(expected, signature_header)

```

> For complete handlers with route wiring, event dispatch, and tests, see:
> 
> * [examples/express/](https://github.com/hookdeck/webhook-skills/tree/main/skills/attentive-webhooks/examples/express/)
> * [examples/nextjs/](https://github.com/hookdeck/webhook-skills/tree/main/skills/attentive-webhooks/examples/nextjs/)
> * [examples/fastapi/](https://github.com/hookdeck/webhook-skills/tree/main/skills/attentive-webhooks/examples/fastapi/)

## Common Event Types

The event name is in the payload's `type` field (Attentive does not send an
event-type header — only the signature header).

| Event | Triggered When |
| --- | --- |
| `sms.subscribed` | Subscriber joins an SMS list |
| `sms.unsubscribed` | Subscriber opts out of SMS |
| `sms.sent` | An SMS message is sent to a subscriber |
| `sms.inbound_message` | A subscriber replies via SMS |
| `sms.message_link_click` | Subscriber clicks a link in an SMS |
| `email.subscribed` | Subscriber joins an email list |
| `email.unsubscribed` | Subscriber opts out of email |
| `email.sent` | An email is sent to a subscriber |
| `email.opened` | Subscriber opens an email |
| `email.message_link_click` | Subscriber clicks a link in an email |
| `custom_attribute.set` | A custom attribute is set on a subscriber |

> For the full event reference, see [Attentive: Create and manage webhooks](https://docs.attentive.com/docs/create-and-manage-webhooks).

## Payload Structure

```json
{
  "type": "sms.subscribed",
  "timestamp": 1721664000000,
  "company": { "id": "..." },
  "subscriber": { "phone": "+15555550123", "email": "user@example.com" }
}

```

`timestamp` is Unix time in milliseconds. Fields present under `subscriber`
vary by event type.

## Important Headers

| Header | Description |
| --- | --- |
| `x-attentive-hmac-sha256` | HMAC-SHA256 signature of the raw body, hex-encoded |

## Environment Variables

```bash
ATTENTIVE_WEBHOOK_SECRET=your_signing_key   # "client secret" from the webhook settings

```

## Local Development

```bash
# Start tunnel (no account needed)
npx hookdeck-cli listen 3000 attentive --path /webhooks/attentive

```

## Reference Materials

* [references/overview.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/attentive-webhooks/references/overview.md) - Attentive webhook concepts and events
* [references/setup.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/attentive-webhooks/references/setup.md) - Dashboard and API configuration guide
* [references/verification.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/attentive-webhooks/references/verification.md) - Signature verification details and gotchas