Amazon has 12 affiliate supported storefronts across the world in, Americas (United States, Canada, Brazil, Mexico), Europe (France, Germany, Italy, Spain, United Kingdom) and Asia (China, Japan, India). In addition, Amazon has additional storefronts in The Netherlands and Australia, which it has not released affiliate support for yet.
Currently, Spreadr supports geo-localization based redirects for US, Canada, Mexico, France, Germany, Italy, Spain, UK and India. You can add associate IDs for these countries. More countries coming soon.
Note - for the Mexico and India Associates Programs, you must have a bank account located within the country.
Sign up for each of the affiliate programs where you see traffic, add the affiliate ID in the Spreadr account, and start earning international commissions.