Custom Variable Template for Google Tag Manager

Reads GA4 _ga_xxxxxx cookie and extracts data

Pick a method to determine a cookie name for the right session either by entering the cookie name or just the measurement id for a data stream.

Chose what value to return:

• Last event timestamp: GA4 updates a timestamp every time an event is sent
• Seconds since last event: calculates elapsed time since last event timestamp
• Session ID: id for current session (matches timestamp of session start)
• Session number: number of current session
• Cookie value: full cookie value (undecoded)