The Amazon Product Advertising API exists to help you more efficiently advertise Amazon products on your web site. The Service exposes Amazon’s product data through an easy-to-use web services interface that is a powerful tool to help Amazon Associate website owners and developers to make money. Associates can now easily build rich and highly effective applications that advertise Amazon products and earn referral fees for driving traffic back to Amazon’s web sites or sales of Amazon products and services. Join the hundreds of thousands of Amazon Associate developers making money by advertising Amazon products today.
Signup at http://aws.amazon.com/associates/ click on Sign Up Now button
After you submit and confirm your application You need:
1) Amazon Access Key ID:
Logon to your Amazon Advertising API account click on Manage Your Account
click on Access Identifiers you will find your id under Access Key ID:
Logon to your site configurator and enter it in the Amazon Access Key ID field.
2) Amazon Secret Access Key:
Logon to your Amazon Advertising API account click on Manage Your Account
click on Access Identifiers you will find your id under Secret Access Key:

