Google checkout will retiring on 11/20/13. All clients who use Google checkout as a payment for all invoices will need to switch to Authorize.net or Paypal. This can be done by simply choosing Authorize.net or Paypal at the top of the invoice. If you have any questions, please feel free to contact us.
Google announcement is available here: https://support.google.com/checkout/sell/answer/3080449?hl=en