Amazon Payments provides Amazon buyers a secure, trusted, and convenient way to log in and pay for their purchases
on your site. Buyers use Login and Pay with Amazon to share their profile information (name,   e-mail address, and
postal code) and access the shipping and payment information stored in their Amazon account to complete their purchase.

Requirments:
      - Web store located in the USA, UK or Germany (available only in these countires)
      - SSL certificate
      - support only onepagecheckout by nopCommerce.com