2checkout accepts account additional along button buttons buy cart cost customers google-checkout optional paypal replace side support the2checkout

I was going to replace my 2checkout with the google checkout, but since I see that e-junkie accepts the2checkout, can I have both so my customers can choose either? Will their be an optional button for the 2checkout in the cart, along side of PayPal and Google checkout, If I add my 2checkout account? Will it cost me more to include it?

Our cart does not support 2checkout. We only provide buy now buttons for 2checkout. There is no additional cost for it.