By becoming transparent, you are enabling the advertiser to view all of your traffic data for the app you are promoting.
NOTE: From your account you can select the app that you want to provide transparency for.
To Enable Transparency navigate to App Settings from the main dashboard and switch the transparency toggle to On.
NOTE: Once transparency has been activated, all data is available to the advertiser from that moment. (Historical data is not transparent). Once deactivated, transparency is no longer available to the advertiser.