Register user identified by USER-TOKEN in store specified by :STORE argument (default: default-password-store). Set password if :PASSWORD is given (default: no password set, meaning locked account). :NEEDS-CONFIRMATION-within (default default-token-validity) makes the account unusable until confirmation has occured. Can be NIL to indicate that no confirmation is needed. Returns up to two values: a user object and possibly the confirmation token.
| register-user < string > |
| register-user < user-token-mixin > |