When uploading products on Amazon, the product code (also known as SKU, Stock Keeping Unit) is a required information. SKU is the basic unit for measuring the inventory in and out of goods, usually composed of numbers or letters, or a mixture of the two. Each product should have a unique SKU so that Amazon can manage inventory and track sales.

Specifically, how to obtain the product code depends on the actual situation of the product. Generally speaking, there are the following situations:

1. If the product is produced independently, you can set the SKU yourself during the production or packaging process of the product. Generally, the SKU setting should be concise and clear, and can accurately distinguish different products.

2. If the product is purchased from other suppliers, you can ask the supplier to provide the SKU of the product. Suppliers usually have their own SKU system to facilitate the management of product inventory and sales.

3. If the product is second-hand or refurbished, you can set a new SKU yourself to distinguish it from the original product.

When uploading products, in addition to the SKU, you also need to fill in the product name, description, price, inventory and other information. In addition, according to Amazon's requirements, you also need to provide product pictures, specifications, weight, packaging dimensions and other information. If the product meets the requirements, you can also apply for exemption from the GS1 code (Global Product Identification Code) requirement.