Class Option Recommendations

Below, is a list of classes that may be updated with final or abstract.
The red stars mention possible upgrade by using final or abstract keywords; The green stars mention a valid absence of the option (an extended class, that can't be final, ...); The absence of star report currently configured classes. .

Final	Abstract	Name	Path
		class OrderState implements ArrayInterface	\orderstate
		class PaymentMethod implements ArrayInterface	\paymentmethod
		class Payment extends AbstractMethod	\payment
		class PlaceOrder extends Action	\placeorder
		class FormattingUtil	\formattingutil
		class CreateOrderRequest	\createorderrequest
		class CreateOrderResponse	\createorderresponse
		class Callback extends Action	\callback
		class SCMerchantClient	\scmerchantclient
		class OrderStatusEnum	\orderstatusenum
		class OrderCallback	\ordercallback
		class ApiError	\apierror