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Webhook Events

Complete documentation for all webhook event types and their payloads.

Event Format​

All events follow this structure:

{
  "id": "evt_abc123xyz",
  "event": "event.type",
  "created_at": "2024-01-15T14:30:00Z",
  "data": {
    // Event-specific data
  }
}

Tag Events​

tag.created​

Fired when a new tag is created.

{
  "id": "evt_abc123",
  "event": "tag.created",
  "created_at": "2024-01-15T14:30:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k",
      "title": "New Product Tag",
      "owner_id": "user_456",
      "permissions": {
        "read": "public",
        "write": "owner"
      },
      "created_at": "2024-01-15T14:30:00Z"
    }
  }
}

tag.updated​

Fired when a tag's content or settings are modified.

{
  "id": "evt_def456",
  "event": "tag.updated",
  "created_at": "2024-01-15T15:00:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k",
      "title": "Updated Product Tag",
      "updated_at": "2024-01-15T15:00:00Z"
    },
    "changes": {
      "title": {
        "from": "New Product Tag",
        "to": "Updated Product Tag"
      },
      "content": true
    }
  }
}

tag.deleted​

Fired when a tag is deleted.

{
  "id": "evt_ghi789",
  "event": "tag.deleted",
  "created_at": "2024-01-15T16:00:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k",
      "title": "Deleted Tag"
    },
    "deleted_by": "user_456"
  }
}

tag.viewed​

Fired when someone views a tag.

{
  "id": "evt_jkl012",
  "event": "tag.viewed",
  "created_at": "2024-01-15T14:35:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k",
      "title": "Product Tag"
    },
    "view": {
      "source": "qr_scan",
      "device": "mobile",
      "browser": "Safari",
      "os": "iOS",
      "country": "US",
      "region": "California"
    }
  }
}

QR Code Events​

qr.scanned​

Fired when a QR code is scanned (distinct from tag.viewed for scan-specific tracking).

{
  "id": "evt_mno345",
  "event": "qr.scanned",
  "created_at": "2024-01-15T14:35:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k"
    },
    "scan": {
      "device": "mobile",
      "os": "iOS",
      "country": "US",
      "city": "San Francisco",
      "coordinates": {
        "lat": 37.7749,
        "lng": -122.4194
      }
    }
  }
}

qr.generated​

Fired when a QR code is generated or downloaded.

{
  "id": "evt_pqr678",
  "event": "qr.generated",
  "created_at": "2024-01-15T14:40:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k"
    },
    "qr": {
      "format": "png",
      "size": 512,
      "generated_by": "user_456"
    }
  }
}

File Events​

file.uploaded​

Fired when a file is uploaded to a tag.

{
  "id": "evt_stu901",
  "event": "file.uploaded",
  "created_at": "2024-01-15T14:45:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k"
    },
    "file": {
      "id": "file_xyz",
      "name": "product-manual.pdf",
      "mime_type": "application/pdf",
      "size": 2457600,
      "uploaded_by": "user_456"
    }
  }
}

file.deleted​

Fired when a file is removed from a tag.

{
  "id": "evt_vwx234",
  "event": "file.deleted",
  "created_at": "2024-01-15T14:50:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k"
    },
    "file": {
      "id": "file_xyz",
      "name": "product-manual.pdf"
    },
    "deleted_by": "user_456"
  }
}

file.downloaded​

Fired when a file is downloaded.

{
  "id": "evt_yz567",
  "event": "file.downloaded",
  "created_at": "2024-01-15T14:55:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k"
    },
    "file": {
      "id": "file_xyz",
      "name": "product-manual.pdf"
    },
    "download": {
      "device": "desktop",
      "country": "US"
    }
  }
}

Sharing Events​

tag.shared​

Fired when a tag is shared with someone.

{
  "id": "evt_share123",
  "event": "tag.shared",
  "created_at": "2024-01-15T15:00:00Z",
  "data": {
    "tag": {
      "id": "tag_123",
      "short_id": "a7Bx9k",
      "title": "Shared Tag"
    },
    "share": {
      "shared_with": "[email protected]",
      "permission": "view",
      "shared_by": "user_456"
    }
  }
}

Event Filtering​

Subscribe to Specific Events​

Only receive events you need:

{
  "events": ["tag.created", "qr.scanned"]
}

Filter by Tag​

Limit events to specific tags (coming soon):

{
  "events": ["*"],
  "filter": {
    "tag_ids": ["tag_123", "tag_456"]
  }
}

Handling Events​

Event Type Switch​

app.post('/webhook', (req, res) => {
  const { event, data } = req.body;

  switch (event) {
    case 'tag.created':
      handleTagCreated(data.tag);
      break;
    case 'tag.updated':
      handleTagUpdated(data.tag, data.changes);
      break;
    case 'tag.deleted':
      handleTagDeleted(data.tag);
      break;
    case 'tag.viewed':
      trackView(data.tag, data.view);
      break;
    case 'qr.scanned':
      trackScan(data.tag, data.scan);
      break;
    case 'file.uploaded':
      handleFileUpload(data.tag, data.file);
      break;
    default:
      console.log(`Unhandled event: ${event}`);
  }

  res.sendStatus(200);
});

Using Event ID​

Deduplicate with event ID:

const processedEvents = new Set();

app.post('/webhook', (req, res) => {
  const { id, event, data } = req.body;

  // Check for duplicate
  if (processedEvents.has(id)) {
    return res.sendStatus(200);
  }

  processedEvents.add(id);
  handleEvent(event, data);

  res.sendStatus(200);
});

Best Practices​

Handle All Subscribed Events​

  • Don't ignore events you subscribed to
  • Log unknown events for debugging
  • Update handling when you add events

Be Idempotent​

  • Same event processed multiple times = same result
  • Use event ID for deduplication
  • Design for at-least-once delivery

Respond Quickly​

  • Process asynchronously if needed
  • Respond with 200 immediately
  • Queue heavy processing

Next Steps​