What is the maximum total amount paid by a customer? List the customer id and amount.
SELECT customer_id ,  sum(amount_paid) FROM Payments GROUP BY customer_id ORDER BY sum(amount_paid) DESC LIMIT 1
SELECT customer_id ,  sum(amount_paid) FROM Payments GROUP BY customer_id ORDER BY sum(amount_paid) DESC LIMIT 1
[{'customer_id': 12, 'sum(amount_paid)': 1000.6500000000001}]