First run: create the owner account.
Send them the app link and their PIN. They log in with their phone number.
Overtime is calculated per workweek (over 40 hours). Open shifts are left out — close them first. The payroll format matches the hours-import columns used by Gusto, QuickBooks Payroll, ADP and Paychex; on your first import, map the columns once if your provider's template names them differently.
Time zone: (set with the TZ variable on the server).