Within fifteen days following completion of a temporary duty assignment, the retired judge shall submit to the Chief Justice of the Supreme Court, on forms provided by the Chief Justice, a request for payment or reimbursement for services rendered and expenses incurred during such temporary duty assignment. Upon receipt of such request, the Chief Justice shall endorse on the request that the services were performed and expenses incurred pursuant to an assignment of the Supreme Court of Nebraska and file such request with the proper authority for payment.