There are many payment gateway's out there (for example an Australian one is http://www.eway.com.au http://www.eway.com.au - never used them/no affiliation) tha

There are many payment gateway's out there (for example an Australian one is http://www.eway.com.au http://www.eway.com.au - never used them/no affiliation) that let you process payments via API. I'd be inclined to pick something like that rather than use Paypal.