Google Checkout module for ZC 1.3.x (beta)

I installed a googlecheckout payment moudle in my website and I set it in admin page, But when i click the googlecheckout button on shopping cart page, it doesn't work,it also retuens shopping cart page ! and then I click the continue checkout button to choose googlecheckout payment method! but it doesn't show in there,I want to know what's wrong with this payment moudle? I search much answer in google, but it can't solve my trouble


This is my site: dscardes.com

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http://www.zen-cart.com/showthread.p...-1-5-amp-1-3-X

for Google Checkout issues.