prestashop work required urgent

we have a preatshop site 1.6 version, with a custom made checkout process using beanstream module, which was modified a bit to suit the way we need it to work However there are many errors coming with this. We need a skilled prestashop programmer, to make a new module for payment processing from scratch for our checkout page. What you need to do is following,:- After the customer enters a product to the shopping cart, right now in many cases, the customer is not able to complete the transaction. So we need you to do the following:- 1) Redesign and make our checkout page from scratch. We have already attempted to fix the error in our current checkout page, but we still keep face errors. So instead of fixing it, we want you to do a complete coding for checkout page from scratch 2) At the checkout page, the customer can complete the purchase using our payment service provider beanstream or via paypal. We want you to make this work 3) We will need several checks to ensure that the data entered by the customer is valid, complete before we send the details to beanstream. So we need the checkout pages to handle all of this kind of errors We need this done within 3 business days as this is very urgent. We will give you the website details, and go over the project in detail once you place your bid. Bid only if you are very skilled in prestashop and if you can do this urgently 1)