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#ask-questions
Title
# ask-questions
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brief-continent-41453

06/26/2023, 12:26 PM
Flutter Tracking Callback >>
hey folks are there any docs on the tracking callback for Flutter SDK? Similar to Go docs
f

fresh-football-47124

06/26/2023, 7:12 PM
growthBookTrackingCallBack
?
👍 1
b

brief-continent-41453

06/26/2023, 7:23 PM
Thanks @fresh-football-47124
@fresh-football-47124 another silly question here: how is the
growthBookTrackingCallBack
sent via RudderStack --> BigQuery so we can compare outcome based on variant a/b. I can see bigquery as a data source for analysis, but can't see how how experiment an variant ids are sent to BigQuery
f

fresh-football-47124

07/12/2023, 4:06 AM
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
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b

brief-continent-41453

07/12/2023, 4:55 AM
@fresh-football-47124 will we need to fire RudderStack
track
event with gb experiment, variant id or is that handled by gb SDK?
f

fresh-football-47124

07/12/2023, 4:59 AM
yes, you need to add one RudderStack track event with the SDK implementation, inside the trackingCallback
👍 1
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