Context: How is \Magento\Sales\Model\Order\Payment::canReviewPayment() implemented and used?
Declaration
Definition
Usage

Magento’s Order View block will check
$order->canReviewPayment()which will look at the_canReviewPaymentvariable on the payment method, and if true, display two buttons on the Order View : “Accept Payment” and “Deny Payment”. When clicked, the two new Payment Method functions we just added above will be called as appropriate.