To provide view your data and optimize bids, AdLabs requires access to your Amazon accounts.
We employ the Amazon Ads API to:
Update data for your profiles
Implement bid and state changes to your campaigns and targets based on your actions

Once you connect your Amazon profiles, we will initiate a backfill of data which usually takes ~30 minutes.
Will clients be notified about this connection?
No, Amazon does not notify brands when an Advertising Account Manager connects a third-party application.
However, if the brand goes to Administration > Account Access & Settings, they can see all authorized users as well as applications which that user has authorized (whether or not the application is currently being used):

Is my data shared with anyone?
Your profile(s) information remains strictly confidential and is only accessible to you. Rest assured, your data is not shared with any third parties.