How to Set Up GA4 Ecommerce Tracking with Google Tag Manager in TrekkSoft

Prerequisites:

• A GA4 property and Measurement ID (e.g., G-XXXXXXXXXX)

Step 1: Add the Google Tag (GA4 Configuration)

1. In GTM, click Tags > New
2. Choose Tag Type: Google tag
3. Enter your GA4 Measurement ID (e.g., G-XXXXXXXXXX)
4. Trigger: All Pages
5. Save and publish

This should load GA4 on every page and enables automatic page_view tracking.

Step 2: Push Purchase Data to the dataLayer

On your Thank You page, insert the following script. You can also place it on your Checkout, Taxes & Fees page:

<script>
  window.dataLayer = window.dataLayer || [];
  window.dataLayer.push({
    event: "purchase",
    eventModel: {
      transaction_id: "",
      value: ,
      currency: "",
      tax: ,
      items: 
    }
  });
</script>

TrekkSoft will enter real booking data into this script. The eventModel object should contain all ecommerce parameters.

Important: Your Booking Data Is Nested Inside Event Model

In TrekkSoft, booking values are nested inside eventModel. Make sure your GTM variables reference keys like eventModel.transaction_id instead of looking at the top level

Example:

eventModel: {
  transaction_id: "30318258",
  affiliation: "richardtravels",
  value: 0,
  currency: "USD",
  tax: 0,
  items: [
    {
      id: "activity-80934",
      name: "Normal Schedule Test",
      variant: "31 October, 2025, 08:00",
      price: 10,
      quantity: 1
    }
  ]
}

 Step 3: Create GTM Variables to Read the Data

In GTM > Variables > New, create the following Data Layer Variables:

Make sure to set Version 2 for each variable.

Step 4: Create the GA4 Purchase Event Tag

1. In GTM > Tags > New
2. Choose Tag Type: Google Analytics: GA4 Event
3. Event Name: purchase
4. Configuration Tag: select your Google tag
5. Event Parameters:

transaction_id:

value:

currency:

items:

• • Event Name: purchase
  • Fires on: All Custom Events

       7. Save

This tag passes the purchase data to GA4 whenever the purchase event runs.

Step 5: Test in GTM Preview Mode

1. Click Preview in GTM
2. Enter your Thank You page URL
3. Complete a test booking
4. Check if these events appear:
   • The purchase event appears in the left panel
   • Your GA4 Event tag fires
   • Variables show correct values

Step 6: Validate in GA4 DebugView

1. Go to GA4 > Admin > DebugView
2. Confirm the purchase event appears
3. Check if these parameters appear:
   • transaction_id
   • value
   • currency
   • items array

Step 7: Publish Your GTM Container

Once everything works:

• Click Submit in GTM
• Name your version (e.g., “GA4 Ecommerce Tracking Live”)
• Click Publish