# Booking-link attribution

Source: [Booking-link attribution](https://typeroll.com/docs/recipes/booking-link-attribution/)

> Preserve advertising parameters across visits and forward them to an external booking link without inventing campaign values.

This recipe configures [Analytics attribution](https://typeroll.com/docs/apps/funnel-attribution/) for a landing page that sends visitors to an external booking service. It is generic: replace the example paths and destination with values from your own site.

## Intended behavior

[Section titled “Intended behavior”](https://typeroll.com/docs/recipes/booking-link-attribution/#intended-behavior)

* Forward `utm_source`, `utm_medium`, `utm_campaign`, `utm_content`, and `utm_term` from the current landing-page URL.
* After optional consent, preserve first-touch and last-touch snapshots for 30 days.
* Prefer current URL values; otherwise use stored last-touch values.
* Add no fallback values. A visitor with neither current nor stored campaign data reaches the original clean booking URL.

## Example rule

[Section titled “Example rule”](https://typeroll.com/docs/recipes/booking-link-attribution/#example-rule)

```json
{
  "id": "campaign-booking",
  "page_paths": ["/campaign/"],
  "source": "current_or_stored",
  "parameters": [
    { "from": "utm_source" },
    { "from": "utm_medium" },
    { "from": "utm_campaign" },
    { "from": "utm_content" },
    { "from": "utm_term" }
  ],
  "targets": [
    {
      "type": "link",
      "host": "booking.example.com",
      "path": "/consultation",
      "click_event": "booking_click",
      "destination": "booking"
    }
  ],
  "storage": {
    "enabled": true,
    "ttl_days": 30,
    "touch": "both",
    "read_touch": "last_touch",
    "consent": "optional"
  }
}
```

1. **Read the existing app state.** Preserve unrelated funnel rules.

2. **Confirm the consent surface.** Storage will not write until optional consent is accepted.

3. **Save and deploy.** The runtime is included in the static customer build.

4. **Verify current attribution.** Use different values for every UTM field and inspect the rewritten booking link without navigating.

5. **Verify stored attribution.** In a controlled browser, grant consent, visit once with campaign values, then revisit without query parameters. The link should reuse the stored last-touch snapshot.

6. **Verify the empty case.** With a fresh browser and no UTM values, the booking URL must remain free of synthetic campaign parameters.

7. **Verify the event without navigating.** When Analytics is enabled, inspect the non-blocking `booking_click` request and confirm it contains only the allowlisted campaign fields. Do not create a booking merely to test it.

Note

A controlled click records a conversion event when Analytics is enabled. It still does not require completing a production booking.