Go to Store - Configuration - Sales - Payment Methods
Configure PayPal PayFlow Pro
Start create order process
Validate credit card number before request to PayPal.
Save information cc_exp_month and cc_exp_year in 'sales_order_payment' table
can enter any chapters into credit card field
cc_exp_month and cc_exp_year did not save in sales_order_payment
Saving cc_exp_month and cc_exp_year is important for me, because I need this information for reauthorization process. It works well in Magento 1.x.
Maybe, this logic is missed in M2, because I can not find save process of this information like in M1.
Also I found initialization of $_canSaveCc field, but I can not find where it field using. It was use in prepareSave() method (app/code/core/Mage/Payment/Model/Method/Cc.php) in M1.