If you are referring to the employee's password for their payslip email, it is consist of eight characters, in the format of:
Example: The password for Ben Narramore with NI no. AB 12 34 56 D would be narrab12
You can also check out this article with more details about emailing payslips to employees and payslips passwords: https://community.intuit.com/articles/1169284
For any other questions or concerns, feel free to reach out to me. Thank you.