Calculate the average payment per product under confections category.
under confections category refers to CategoryName = 'Confections';
SELECT SUM(T2.UnitPrice * T2.Quantity * (1 - T2.Discount)) / COUNT(T1.ProductID) FROM Products AS T1 INNER JOIN `Order Details` AS T2 ON T1.ProductID = T2.ProductID INNER JOIN Categories AS T3 ON T1.CategoryID = T3.CategoryID WHERE T3.CategoryName = 'Confections'