I'm setting up a store, and have added these lines to user.config
<add key="Site8-GoogleProductionMerchantID" value="yyy"/>
<add key="Site8-GoogleProductionMerchantKey" value="xxx"/>
<add key="Site8-PrimaryPaymentGateway" value="GoogleCheckout"/>
But when I get to my cart, there's no Google checkout button.
I've not yet configured the return URL in my Google Checkout account, but was expecting the button to appear once the above settings were in place.
What is required to make the button appear? Any guidance appreciated.