Not registered as an Amazon Associate API Error

If you get an error like:

Amazon API returned error: Your ABCDEFGHIGKLMN is not registered as an Amazon Associate. Please register as an associate at https://associates.amazon.ca/gp/associates/join/landing/main.html.

Don't panic!

Please follow these guidelines to add the Product Advertising API email address as a secondary user in your Amazon Associates account. You may find the Account Settings link in the top right corner in your Amazon Associates account in UK.

You will be able to successfully access Product Advertising API once the secondary user is successfully added in the respective Amazon Associates account.