Suggest instead of just reading the cover, read all the documentation provided at AA-Team.
First the new API 5 interface, Amazon requires that you have 3 sales in the first 180 days before they will issue API keys to your Amazon account.
WZone provides a solution for this that allows you NO PA API KEYS DIRECT IMPORT EXTENSION.
In config > Amazon you need to insert each Amazon Access Key for each Amazon Affiliate Store that you want to direct your customer too. Otherwise, you will not get the commission for any sale.
The plugin does work, you just need to learn by reading how to make it work.