The processing period of the payroll.
One of three_day, two_day, or one_day.
The processing period determines the approval deadline of the payroll. For a payroll with a Friday payday, three_day will mean the approval deadline is on Tuesday, whereas two_day will mean the approval deadline is on Wednesday, and one_day will mean the approval deadline is on Thursday.
The possible values for this field are constrained by the processing periods the company is approved for.
Default: processing_period of the company