Answer: "FEE - FOR - SERVICE" is considered to be a form of bundle payment.
Explanation: Bundle payment is a means of using incentives to compensate workers for a job done. In it's simplest term, it means the different ways of paying wages and salaries.
Fee-for-service is a retrospective type of payment, where workers are paid directly from the employer, for doing their job. The employee get less payment when the cost price is high, and high payment when the cost price is low. The employer checks the performance and level of each employee and pays directly to them.