The Amazon Advertising API enables third-party applications to manage Sponsored Products campaigns on behalf of sellers on Amazon.
You can programmatically sync data and create and manage campaigns, ad groups, ads, keywords, bids, and budgets. The application can also have a reporting interface to help you analyze your data.
Learn more on the Advertising API Website.
If you have provided authorization to an integrator, service provider, or agency to manage your accounts for you, you can remove those authorizations by visiting https://www.amazon.com/ap/adam. Sign in with your credentials and select the connection for which you would like to remove authorizations.