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A merchant is a company that sells their items on www.amazon.com and handles their own order fulfillment, returns, and customer service. The only exception is Amazon, which is also a merchant.
Individuals and companies cannot apply to become a merchant. They are selected by Amazon to increase the breadth of offerings on www.amazon.com. Although most companies are not eligible to be a merchant, this section briefly describes merchants because Amazon Associates Web Service operations access items sold by merchants. In fact, the vast majority of items sold on Amazon are sold by merchants.
There are two kinds of merchants, as shown in the following figure.
Merchants@ sellers are so-called because they appear on Amazon's retail web site. They use Amazon's Seller Central to create their own detail pages, configure their own store front, and create their own promotions. For more information about SellerCentral, see http://sellercentral.amazon.com.
The largest seller on www.amazon.com is Amazon. It is considered a merchant. Its merchant ID is the default value for the Amazon Associates Web Service operation parameter, MerchantId, which means that if you do not specify another merchant or seller, search results will return items sold by Amazon.
Amazon's merchant ID varies by locale, as follows:
| Locale | MerchantId Value | Domain Name |
| US | ATVPDKIKX0DER | www.amazon.com |
| CA | A3DWYIK6Y9EEQB | www.amazon.ca |
| DE | A3JWKAKR8XB7XF | www.amazon.de |
| FR | A1X6FK5RDHNB96 | www.amazon.fr |
| JP | AN1VRQENFRJN5 | www.amazon.co.jp |
| UK | A3P5ROKL5A1OLE | www.amazon.co.uk |
