* Feature - Support gift card refunds.
* Feature - Added compatibility with WooCommerce Payments to hide unsupported quick-pay buttons in gift card product pages.
* Fix - Fixed fatal error that showed up when trying to edit a gift card associated with a deleted order.
Fix - Prevent an issue when importing gift cards with zero remaining balance.
Fix - Prevent gift cards codes from being applied to orders multiple times.
Fix - Fixed an issue affecting the 'Self-use gift card received' email settings.
* Fix - Removed the 'wc_gc_send_as_gift_checkbox' parameter from the permalinks of non-Gift Card cart/order items.
* Tweak - Improved invalid Gift Card code length notice.
Fix - Fixed failed Gift Card imports when e-mails values contain whitespaces.
* Feature - Let customers purchase gift cards for self-use, bypassing the gift card purchase form.
* Feature - Allow customers to carbon copy (cc) gift card e-mails to additional recipients.
* Feature - Allow merchants to blind cabon copy (bcc) additional recipients to all gift card e-mails, handy for testing and archiving purposes.
* Feature - Added compatibility with PayPal Payments to hide quick pay buttons in gift card product pages.
* Fix - Fixed missing notices.
Fix - Fixed incorrect early returns in 'set_notice_option'.