Write SQL query to solve given problem: Which payment method is most comonly used by the schools in the state of Georgia for the payment of donations?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.payment_method FROM donations AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid WHERE T2.school_state = 'GA' GROUP BY T2.school_state ORDER BY COUNT(T1.payment_method) DESC LIMIT 1