Who cares about unique identifiers?

Almost everyone has been on the receiving end of a request to provide photo identification (most commonly a drivers’ licence or a passport) when applying for a bank account, or purchasing a new mobile phone, or some similar account-based transaction. The person making the request typically either writes down the details of the document or photocopies it. But there is one piece of information that should not be captured unless there is a legitimate reason to – the unique identifier.
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