What are the id and the amount of refund of the booking that incurred the most times of payments?
SELECT T1.booking_id ,  T1.amount_of_refund FROM Bookings AS T1 JOIN Payments AS T2 ON T1.booking_id  =  T2.booking_id GROUP BY T1.booking_id ORDER BY count(*) DESC LIMIT 1
booking that incurred the most times of payments refers to booking with MAX(count(payment_id)); id refers to booking_id; amount of refund refers to amount_of_refund;