Square processes credit cards for less than Paypal, provides charge-back protection up to $250 per month, automatically deposits your payments received to your bank account in 1 or 2 business days, and charges no monthly fees. Overall, I think they are a better payment processor than Paypal. If you want to check them out, here's their website address: https://squareup.com/
I recently emailed Cubecart Sales requesting a rough estimate on what it would take to integrate Square's payment APIs into Cubecart. He responded as follows.
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I'd like to see Square implemented to look and act just like Paypal Pro does. I'm sure this would cost more than the simple integration Al quoted. The more people willing to help out financially the less it would cost each of us. Are any of you willing to help sponsor this integration?