If your Amazon integration has stopped working it could be due to a number of reasons.Firstly, please visit the stores settings page, click on your Amazon connection and then click the Test connection button.The connection tester tool will let you know if Zenstores can connect to your store. If it can't connect it will tell you what is causing the problem. See below for a list of possible issues and how to resolve them.The Seller ID or MWS Authorization Token is invalid.Solution: Please follow steps 4 to 10 of the following guide: How to connect your Amazon store with Zenstores. Then, check that the Seller ID and MWS Authorization Token are correct in Zenstores.Your MWS Authorization Token has expired and needs to be renewed.Solution: Please follow steps 4 to 11 of the following guide: How to connect your Amazon store with Zenstores. Make sure you replace the old Seller ID and MWS Authorisation Token in Zenstores with the new details.Other factors that could cause issues Someone has changed the settings in your Amazon MWS account.Solution: Please log in to your Amazon MWS account and check that Zenstores still has permission to access your Amazon MWS account.Amazon has frozen or suspended your seller account.Solution: Please contact Amazon support. When your seller account has been re-instated, test your connection to ensure the connection is working again.