There might be a time when you will receive a message from us regarding the fact that one of the authorizations for one of the market regions (Europe/North America) is no longer valid.
This means that, for whatever reason, the authorization token that we received when you first authorized Vendorati was deemed invalid or expired by Amazon.
In order to fix this issue all you have to do is go to the Settings section and reauthorize Vendorati for that region.