* Tweak - Hide lightbox on Escape keypress and background click
* Tweak - Improve lightbox accessibility for screen readers and keyboard navigation
* Tweak - Remove authorization message from My Payment Methods page where it is not applicable
* Fix - Prevent a duplicate transaction error when the CSC is entered incorrectly as a guest
* Fix - Ensure checkout can be completed after initial declines
* Fix - Ensure a payment method's last four are saved to the order when paying with a saved method
