Using Google Checkout
Here is how to do it. There is a little bit more to it than PayPal, but not much. The slightly lower fees should make the tiny bit of extra work worthwhile. Make sure you have SSL set up on your store before continuing.
Go to the Google site for your country or region. Click on Business solutions and then Checkout and sign up for a Google Checkout account if you do not already have one at https://checkout.google.com.
Installing the checkout
Is your Google Checkout account open in a tab on your browser and your PrestaShop control panel in another? If it is that then we will be clicking back and forth between the two.