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Hi Luan, You don't need to have data already, though you'll need some data to show results. We join from the exposure info, then to the metric info

@fresh-football-47124 Can you provide an example of a tracking callback script for BigQuery (without using GA4)? I’m unsure how to match anonymous "user IDs" with purchases. Do I need to send the "user ID" (for non-logged-in users) in the tracking callback script? Thank you Graham!

Hi! You don't likely want to send data to BigQuery without GA4. Instead, you can set up purchase tracking (and other e-commerce events) via GA4, which will allow you to match purchases between your experiment and other data. https://developers.google.com/analytics/devguides/collection/ga4/set-up-ecommerce