# Coinbase Commerce Webhooks

## When to Use This Skill

* Setting up Coinbase Commerce webhook handlers for cryptocurrency payments
* Debugging `X-CC-Webhook-Signature` verification failures
* Understanding Coinbase Commerce charge event types and payloads
* Handling `charge:confirmed`, `charge:failed`, or `charge:pending` events

## Verification (core)

Coinbase Commerce signs the raw request body with HMAC-SHA256 keyed on your
webhook shared secret and sends the hex digest in the `X-CC-Webhook-Signature`
header. Verify against the raw body (never the parsed JSON) and compare
timing-safe. The event object is nested under the `event` key in the body.

Node — use the official [`coinbase-commerce-node`](https://www.npmjs.com/package/coinbase-commerce-node) SDK:

```javascript
const { Webhook } = require('coinbase-commerce-node');

// Throws SignatureVerificationError on mismatch; returns the verified event.
// rawBody MUST be the raw request body string, not re-serialized JSON.
const event = Webhook.verifyEventBody(rawBody, signature, sharedSecret);
console.log(event.type, event.data.id); // e.g. "charge:confirmed"

```

Manual (any language) — HMAC-SHA256 hex of the raw body, timing-safe compare:

```python
import hmac, hashlib

def verify(raw_body: bytes, signature: str, secret: str) -> bool:
    expected = hmac.new(secret.encode(), raw_body, hashlib.sha256).hexdigest()
    return hmac.compare_digest(expected, signature or "")

```

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

## Common Event Types

| Event | Triggered When |
| --- | --- |
| `charge:created` | A new charge is created |
| `charge:pending` | Customer paid; payment detected on-chain but not yet confirmed |
| `charge:confirmed` | Payment confirmed — the charge is complete |
| `charge:failed` | The charge failed or expired without full payment |
| `charge:delayed` | Payment arrived late or was underpaid/overpaid |
| `charge:resolved` | A previously delayed charge has been resolved |

> For full event and payload reference, see [references/overview.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/coinbase-commerce-webhooks/references/overview.md).

## Important Headers

| Header | Description |
| --- | --- |
| `X-CC-Webhook-Signature` | HMAC-SHA256 (hex) of the raw request body |

## Environment Variables

```bash
COINBASE_COMMERCE_WEBHOOK_SECRET=your_webhook_shared_secret   # Settings > Notifications

```

## Local Development

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

```

## Reference Materials

* [references/overview.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/coinbase-commerce-webhooks/references/overview.md) - Coinbase Commerce webhook concepts and events
* [references/setup.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/coinbase-commerce-webhooks/references/setup.md) - Dashboard configuration and shared secret
* [references/verification.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/coinbase-commerce-webhooks/references/verification.md) - Signature verification details and gotchas