People usually receive these message from Google Checkout when they switch from test mode to live mode in their Shopping Cart Google Checkout module settings. This is because the test server and the live server of Google Checkout are 2 different servers and therefore require 2 different merchant IDs. When you change the test mode setting in the Shopping Cart Google Checkout module from 'Yes' to 'No', make sure that you also change your merchant ID that points to the proper live Google Checkout server.

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