1. Login to your Amazon Seller Central account. Go to 'Settings' in the top right corner and select 'User Permissions' from the drop down menu.
2. Scroll down to the 'Third party developer and apps' section and click 'Visit Manage Your Apps.'
3. Find the Bibliopolis-NA account (or Bibliopolis-EU if you are a European seller). Click the 'View' link under the 'MWS Auth Token' column.
If you are a North American seller (US, CA, MX), then enter the 'Developer's Name' as Bibliopolis-NA and the 'Developer ID' as 5549-6721-4163.
If you are a European seller (UK, DE, FR, IT, ES), then enter the 'Developer's Name' as Bibliopolis-EU and the 'Developer ID' as 3007-8549-0646.