SELECT t1.payment_method FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id  =  t2.customer_id JOIN order_items AS t3 ON t2.order_id  =  t3.order_id GROUP BY t1.customer_name ORDER BY sum(t3.order_quantity) LIMIT 1
What is the payment method of the customer that has purchased the least quantity of items?
SELECT t1.payment_method FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id = t2.customer_id JOIN order_items AS t3 ON t2.order_id = t3.order_id GROUP BY t1.customer_name ORDER BY sum ( t3.order_quantity ) LIMIT 1
select t1 . payment_method from customers as t1 join customer_orders as t2 on t1 . customer_id = t2 . customer_id join order_items as t3 on t2 . order_id = t3 . order_id group by t1 . customer_name order by sum ( t3 . order_quantity ) limit value
What is the payment method of the customer that has purchased the least quantity of items ?