I'm using a php script for a web site where visitors to the site can keyword search to find specific files. I'd like the vistors to pay for files before they can view them.

So, I'm looking for a solution that can somehow see the number searched, multiply that by a set dollar amount, send the vistitor to pay that amount, via Paypal, and return the visitor to a protected page to view the document in a unique session.

Can Zencart be used for this type of solution?
Thanks