The One Time Payment function in Workday is used to approve and track bonuses, severance payments, signing bonuses, retention bonuses, and other special payments to employees. HR partners initiate one time payments in Workday according to eligibility and approval requirements before the payment is processed. The approval workflow varies based on the type and amount of payment but involves conditional approvals from compensation managers and administrators. HR partners must enter key details about the payment and then submit it for the defined approval process.