It is a requirement put in place by the various authorities that online bookies must be sure that their customers are at least 18 years of age and that they are who they say they are. Many bookies carry out checks automatically, but if these checks prove inconclusive, new customers will receive a KYC (know your customer) request, which means they will be asked to prove their identity by sending in copies of their passport/driving licence, a scan or photograph of the payment method and a scan or photograph of a utility bill which is less than 3 months old.