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GrowthBook Users

hey folks are there any docs on the tracking callback for Flutter SDK? Similar to <https://docs.growthbook.io/lib/go#tracking-callback|Go docs>

<@U01T6HCHD0A> another silly question here: how is the `growthBookTrackingCallBack` sent via RudderStack --&gt; BigQuery so we can compare outcome based on variant a/b.

I can see <https://docs.growthbook.io/guide/rudderstack|bigquery as a data source> for analysis, but can't see how how experiment an variant ids are sent to BigQuery

the trackingCallback sends the experiment name, variation id, user id (or other randomization unit) and timestamp to rudderStack

from there its joined to all the other metrics

that part you have to adjust when you add the SDK

<@U01T6HCHD0A> will we need to fire RudderStack `track` event with gb experiment, variant id or is that handled by gb SDK? 

yes, you need to add one RudderStack track event with the SDK implementation, inside the trackingCallback