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6 characters in length (letters and digits)
Letters are all capitals
we don’t use I or L letters - instead we use 1 only
we don’t use O (capital 0), instead we use 0 (zero) onlyThe values are converted to [0~9, A~X] (34 digit), and after the convert, ‘I' & ‘O’ (capital o) are, then, converted to ‘Y’ & 'Z’.
First 5 characters are ramdomly generatedgenerated from time based - in order to provide uniqueness.
Last 1 character is a control character, calculated by Summing the first 5 characters, and then taking the reminderremainder.
Typical voucher operations
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