I have a client who wants to set up a website doing administrative work for various businesses - the client would receive payments from the business' customers, take a small commission and pass the rest of the money onto the business. The problem is that, because my client is initially receiving the complete sum of money (before taking the commission only), he may have to pay VAT, because of the high turnover - is this correct? If so, my client has asked me whether there is a payment processor that offers a split payments system?