In order to post Amazon products to your site, you will need an API key, API Secret, Associate Tag.
API Key: If you already do not have an Amazon associate account then you can create a new account from here and collect your keys by following this link.
API Secret: You will be able to collect the API Secret following the same process of collecting the API Key.
Associate Tag: Amazon offers commissions for visitors that are sent from Amazon associates. The Amazon associate tag is important to collect commissions. You must have already created your account. You will find the tag after logging in your account.