Hi Rob And Juls, hope you are both well. Due to the problems this year Maggie and me decided not to travel to Gumusluk . But we managed to pay online. You will need your sicil number which you can find on your previous payment receipts. https://ebelediye.bodrum.bel.tr/webportal/index.php
Follow the link above and in the drop down box go to Hizli odeme (fast payment) it will show you what you owe and take you to a payment page.
It cost us 194.81tl each for the year using our credit card.