We have a google checkout account, but wish to use it with multiple prestashops, In the Google checkout intergration on google you have to set a return url for a successfull transaction so this obviously stops the use of multiple prestashops, but looking at the google api, you can sent google the return checkout url when connecting as follows
<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.continue-shopping-url" value="http://www.example.com"/>
Looking at the google checkout module I noticed the following
$googleCart->SetContinueShoppingUrl('http://'.$_SERVER['HTTP_HOST'].__PS_BASE_URI__.'order-confirmation.php');
Is it possible just to add
$googleCart->Setcheckout-flow-support.merchant-checkout-flow-support.continue-shopping-url('https://'.$_SERVER['HTTP_HOST'].__PS_BASE_URI__.'modules/gcheckout/validation.php');
To allow multiple site then remove the return url from our google checkout account settings Just tried in sandbox mode and it fails, so more mods needed