Create a Checkout in PHP

We are looking for a freelancer who can do a checkout in PHP/mySQL. The checkout should be connected to a Swedish payment gateway (Payson), please see attached process graph (the checkout part is from "[login to view URL]" and onwards). More features: - Customer data saved in mySQL - Mail confirmation sent to customers - Basic backend (So we can view orders) A good programer can do it under 50 hours. When bidding, please state your price for a 50 hour job.