If you want to track which marketing channels are actually generating bookings and revenue in Google Analytics 4, you can connect your ReservationKey booking engine to GA4 ecommerce tracking using ReservationKey's built-in data layer. This guide walks through a working setup that supports: - Revenue attribution in GA4 - Cross-domain tracking between your website and ReservationKey booking pages - Ecommerce `purchase` events - Tracking by room, cottage, cabin, or unit - Attribution from sources like Facebook, Instagram, TripAdvisor, Google Search, and more Special thanks to ReservationKey customer Paul from Kauai Cottages for helping test and refine this approach. ## How the Tracking Works The setup uses two pieces: - A GA4 tracking script loaded on every ReservationKey booking page - A purchase event script that runs only on the final confirmation page The purchase event reads booking details from: ```javascript window.reservationData ``` This object contains reservation information such as: - Reservation ID - Payment amount - Taxes - Room/unit ID - Check-in/check-out dates - Guest count - Page alias This data is available reliably on the final confirmation page. See this blog post for complete data layer specifications. ## Important: Do Not Use ReservationKey Merge Codes for GA4 Ecommerce Tracking Some users initially try using ReservationKey email merge codes such as: ```text {{CONFIRMNUM}} {{TOTALPRICE}} {{ROOMNAME}} ``` However, these merge codes are designed for ReservationKey email templates, not JavaScript ecommerce tracking. Instead, always use: ```javascript window.reservationData ``` ## Step 1 - Add the GA4 Script to Code on Every Page In ReservationKey, go to: ```text Website -> Reservation Pages -> Edit -> Settings -> Settings 2 ``` Paste this into: ```text Code on EVERY page ``` ```html ``` Replace: - `G-XXXXXXXXXX` with your GA4 Measurement ID - `yourwebsite.com` with your own domain name ## Step 2 - Enable Cross-Domain Tracking in GA4 Inside Google Analytics 4, go to: ```text Admin -> Data Streams -> Your Web Stream ``` Then: ```text Configure tag settings -> Configure your domains ``` Add: - `yourwebsite.com` - `v2.reservationkey.com` This allows GA4 to preserve the original traffic source when visitors move between your website and ReservationKey booking pages. Without this step, bookings may appear as: ```text referral / v2.reservationkey.com ``` instead of the original source, such as: - Facebook - Google organic - Instagram - TripAdvisor - Email campaigns ## Step 3 - Add the Purchase Tracking Script In ReservationKey, go to: ```text Website -> Reservation Pages -> Edit -> Settings -> Settings 2 ``` Paste this into: ```text Code ONLY on final confirmation page ``` ## Example GA4 Purchase Tracking Script This example tracks: - Transaction ID - Revenue - Taxes - Unit name - Unit ID - Ecommerce purchase event ```html ``` ## Understanding window.reservationData The ReservationKey booking engine exposes reservation information through: ```javascript window.reservationData ``` Some useful fields include:

Field	Description
`id_reservation`	Reservation confirmation number / transaction ID
`payments`	Total payment amount
`taxes`	Tax amount
`total_room_price`	Room price before taxes/fees
`id_room`	Room or unit ID
`page_alias`	Booking page alias

You can inspect this object in your browser console: ```javascript console.log(window.reservationData) ``` ## Testing Your Setup After placing a test booking: 1. Open Browser Developer Tools. 2. Check the console for messages like `[RK PURCHASE]`. 3. In GA4, go to `Reports -> Realtime`. You should see: - A purchase event - Revenue values - Transaction IDs - Item names ## Recommended Approach For most ReservationKey customers, the best setup is: - Use GA4 with cross-domain tracking - Use `window.reservationData` - Track purchases using ecommerce events - Map your room IDs to readable unit names This gives you much better visibility into: - Which marketing channels generate bookings - Revenue attribution - Conversion tracking - Return on ad spend

ReservationKey Blog

Tracking ReservationKey Bookings as GA4 Ecommerce Purchases