Customer profile rollover when the card has been completely used

As it was mentioned, we consider an e-mail of a client to be his true identity. Hence a unique e-mail is associated with only one value account, created when the first card of particular issuer is used the first time. Subsequent cards, produced by the e-mail owner, add value to the same account and do not change his digital identification number. This ensures a correct client profile ‘rollover’ when he starts using new cards and minimizes the probability of value loss; unused balance of old card is appended to the balance of new one.