WordPress modification needed-1

Hi there, we need for a new project of us a wordpress expert who is able to do a very special modification. It should be a kind of verified review. We are running a a listing directory site with restaurants and we want verified reviews oft he restaurants. So we thought about a system similar to a referal system. Restaurants should acquire customers to leave a review at our directory. But we want to track the customers who came from one restaurant. Maybe it is possible that a QR code or a referal shorten link is generated automatically, when a new listing is published at our site. So the restaurants can promote their QR code or shorten at their restaurant. If a customer is going to leave a review from the referal link, the review should be marked as ‚verified customer‘. The project hast o be finishe das soon as possible. Please start your bid with ‚Review verification‘ so that we can see you have read the description. We dont want price negotiations after you bid. Such discussions are just time wasting.