Any member who is active on July 1, 2016, may obtain creditable service for any service in excess of 20 years as judge of the probate court, employee of the board, or secretary-treasurer, but not more than the actual number of years of service or 30 years, whichever is less. Any such member shall make application in such form and manner as the board deems appropriate and shall pay to the board an amount determined by the board to be sufficient to cover the full actuarial cost of granting the creditable service as provided in this Code section. Any such application and payment must be received not later than December 31, 2016.