This document is a Vendor Guide for the Amazon EU Global Data Synchronization Network (GDSN). It outlines the importance of GDSN in maintaining accurate product data that supports both supply chain and customer-facing attributes. The guide explains Amazon's initiative to enhance the integration of GDSN data within its catalog, focusing on improving receive accuracy and reducing vendor shortages. It details the steps vendors must follow to synchronize their product information with Amazon, including joining a GDSN data pool, connecting through Vendor Central, and ensuring accurate item data publication. The guide also provides information on the critical nature of connecting to Amazon GDSN and the process for reporting issues. Additionally, it addresses frequently asked questions regarding the benefits of GDSN, the impact on purchase orders, and the timeline for future enhancements to the New Item Setup process. Overall, the guide serves as a comprehensive resource for vendors looking to leverage GDSN for improved operational efficiency.