Duration
Duration (in seconds) a token is valid for.
Digits
The number of digits for the token
sha-1
The algorithm used for calculating the HMAC, default is 'sha1'.
Secret key used by the hash function to calculate the HMAC. You could encode/decode or generate secret keys in various encodings XOPT Secret() constructor.
The account is the identifier/name of the user who token is issued for and the issuer is the provider or service managing that account. They are just arbitrary labels using by apps.
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