Am getting the following error message when I trial a purchase on my website using google checkout (the same transaction works when using Paypal)
http://www.gardenbeet.com


<?xml version="1.0" encoding="UTF-8"?>
<error xmlns="http://checkout.google.com/schema/2" serial-number="c4c75896-2d50-49d4-869c-f9bcc13030fa">
<error-message>
Bad username and/or password for API Access.</error-message>
</error>


I have triple check the Google Merchant ID and Google Merchant Key and they are all OK. I ahev posted this question on Serif help and Google and Mal's cart but no luck.

thanks in advance