eBay Rolls Out Authenticity Guarantee for High-Value Trading Cards in the UK, Becoming First Online Marketplace to Make Verification Standard
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Among the largest consumer electronic dealers of U.S., Newegg Marketplace is an online retailer of items including computer hardware and consumer electronics consumer electronics. It is based in City of Industry, California, in the United States.
To sell on Newegg.com, some mandatory fields are required, among them Product Identifiers find the prominent place.
It’s a universally recognizable ID, and is unique for each individual item. They are used in Newegg for identification and comparing it with different associated seller’s, further to which different associated variants could be established.

| Accepted Type | Name | Description | Acceptable digit |
| MPN | Manufacturer Part Number | Manufacturer defined unique identifier for an item. An alphanumeric string, max 20 characters including space. | Max 20 characters |
| UPC | Universal Product Code | General purpose, used primarily in United States, United Kingdom, Australia, New Zealand | 12 digits |
| EAN | European Article Number | General purpose, used primarily outside North America | 13 digits |
| ISBN | International Standard Book Number | Paperback, Hard Cover and Electronic Books | 10-13 digit |
Moreover, all the marketplaces – Amazon, Newegg, Walmart, Jet, Rakuten etc. – require UPC codes as a product identifier. On the basis of these UPCs, the two similar products are differentiated that they belong to different sellers.
And if you don’t know how to generate Product Identifier for your products, read the blog:
http://cedcommerce.com/blog/generate-upc-code/
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