If you need to write an EAN code for products sold on Amazon, you can do it by following the steps below:

1. Register as a member of the Global Trade Item Number (GTIN) management agency, such as GS1.

2. On the website of the GTIN management agency, apply for an EAN code suitable for your product.

3. Based on the product information you provide, the GTIN management agency will assign you a unique EAN code.

4. Print the EAN code assigned to you on the product packaging or provide it in the product information page on Amazon.

Please note that the EAN code is unique and each product should have a unique EAN code. In addition, make sure you comply with Amazon's product coding requirements and policies. If you have any questions, it is recommended that you consult Amazon's seller support team or relevant logistics and supply chain professionals.

When writing an Amazon ean code, you first need to determine the product's International Standard Book Number (ISBN) or International Article Code (UPC). Then, convert this ISBN or UPC into an EAN format that is compatible with Amazon. EAN is a 13-digit international product barcode, where the first three digits represent the international manufacturer identification code, the next four digits are the product code, and the last is the check digit. When writing the EAN code, make sure the first three digits are the correct international code, then add the product code, and calculate the check digit to ensure the accuracy of the barcode.

Finally, attach the written EAN code to the product and upload it to the Amazon platform for sales and tracking.

Amazon EMC cannot be written by yourself, you must buy it on the official website.