I really cannot stress enough that you should be posting your questions in the Vendio Services forum, rather than this forum. This forum is *not* actively monitored.
You may turn off Google Checkout by going to "Preferences" (at the top right of most pages in your Vendio account) --> select "Items" from the drop-down box at the top of the page --> scroll down to the "Google Checkout" section --> uncheck the box for "Add Google Checkout Button" and save your changes.