Does my leave go into my Google or Outlook calendar and into payroll?

Into your calendar yes, at the push of a button: under “Absences” → “My calendar · sync absences”, “Sync calendar” blocks your approved absences in your primary Google or Outlook calendar, without private reasons. Your calendar must be connected under Settings → Integrations. For payroll, an admin creates a file with locked working times and approved absences using “Export payroll”. There is no direct connection to a payroll program.