Clarify instructions for GTM

[GrottyMC]

The current documentation shows a ga('create') code snippet but doesn't provide clear instructions for GTM implementation specifically.

Current Documentation:

The documentation explains that the clientId value is passed as a parameter in the URL of the success page:

/checkout/onepage/success/?clientId=****/

It mentions that this should be "extracted and used in the javascript code that triggers the GA/UA/GTM/other event for the conversion."

The provided code example shows:
javascriptga('create', 'UA-XXXXX-Y', {
'storage': 'none',
'clientId': myClientId
});

Issue:
For GTM specifically, it's unclear whether we should:

• Use a GTM Config tag to send the clientId
• Use a GTM Purchase/Conversion tag to send the clientId
• Or both?

[AlbinaBaraliu]

Hi @GrottyMC,

You only need to use the GA4 Config tag in GTM.

The Purchase tag will automatically inherit the client_id from the Config tag, so there’s no need to set it in both places.

Why: The Buckaroo module already adds the clientId as a URL parameter on the success page. Setting it in the Config tag ensures all events on that page (including the purchase) use the correct client identity.

Best regards,
Albina