Simplyfing payment process on Webpage

Avg Bid (USD)
Project Budget (USD)
$200 - $400

Project Description:
We want to simplify the payment process on our page. The page has Offers from users that can be bought by other users.

The process at the moment has implemented Paypal-API and the user buying an offer transfers the money to our account. After the offer has been fulfilled we transfer the money from our to the sellers account.

What we want now is that the buyer does not have to pay through our website but directly to the seller (analog Ebay). We do not want to be involved into the payment process anymore.

For every sold offer the seller has to pay us a certain fee for which he should get an invoice by Email which he can pay by Paypal.
If the offer cannot be fulfilled because of the buyer the fee should be returned automatically.

It might sound a little bit complicated but the tasks should be quite simple:
1.) Remove current payment system
2.) Implement new Invoice Payment System

Remember: all the functionalities have still to be working (e.g. Rejection of an offer, Userreviews etc.)
If you want to have a look at the page (which I recommend), send me a message

Thanks and best regards

Skills required:
CakePHP, eCommerce, MySQL, Paypal API
About the employer:
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