* Fix - Replace deprecated `is_ajax()` calls with `wp_doing_ajax()` * Misc - Require WooCommerce 3.9.4 or greater
* Fix - Ensure stored payment methods are removed from customer account when a customer profile is removed from Authorize.Net CIM
* Tweak - Add the zip code and full name optional fields to card payment requests * Fix - Address potential payment form JavaScript errors when customer reaches checkout with a $0 order
