Please refer the below error
[16-May-2020 12:22:03 UTC] billing_email was called incorrectly. Order properties should not be accessed directly. Backtrace:
require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), do_action(‘template_redirect’), WP_Hook->do_action,
WP_Hook->apply_filters, WC_AJAX::do_wc_ajax, do_action(‘wc_ajax_checkout’), WP_Hook->do_action, WP_Hook->apply_filters,
WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, Easypay_Payment_Gateway->process_payment,
WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.
[16-May-2020 12:22:03 UTC] billing_phone was called incorrectly. Order properties should not be accessed directly. Backtrace:
require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), do_action(‘template_redirect’), WP_Hook->do_action,
WP_Hook->apply_filters, WC_AJAX::do_wc_ajax, do_action(‘wc_ajax_checkout’), WP_Hook->do_action, WP_Hook->apply_filters,
WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, Easypay_Payment_Gateway->process_payment,
WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.