Store: checkout and payment gateways. PHP MySQL

Avg Bid (GBP)
Project Budget (GBP)
£100 - £450

Project Description:
I require help finishing my online store. It is written in PHP and MySQL.

What I require:
- Checkout page (calculate total).
- Payment gateways/API. Integrate store with PayPal and Google Checkout.
- Thank you for ordering page
- Input order (after approval from PayPal or Google Checkout) into database.

Everything you write must be very well documented/commented so that I can make changes (like multiple order postage discounts) in the future.

The product listings are already done ( and so is most of the cart. I require your knowledge of integrating PHP and MySQL with PayPal and Google Checkout to help me finish my shopping cart.

Skills required:
MySQL, PHP, Shopping Carts
About the employer:
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