Initial commit
diff --git a/includes/compat/class-wc-stripe-email-failed-authentication-retry.php b/includes/compat/class-wc-stripe-email-failed-authentication-retry.php
new file mode 100644
index 0000000..4920a3d
--- /dev/null
+++ b/includes/compat/class-wc-stripe-email-failed-authentication-retry.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * Admin email about payment retry failed due to authentication
+ *
+ * Email sent to admins when an attempt to automatically process a subscription renewal payment has failed
+ * with the `authentication_needed` error, and a retry rule has been applied to retry the payment in the future.
+ *
+ * @version     4.3.0
+ * @package     WooCommerce_Stripe/Classes/WC_Stripe_Email_Failed_Authentication_Retry
+ * @extends     WC_Email_Failed_Order
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * An email sent to the admin when payment fails to go through due to authentication_required error.
+ *
+ * @since 4.3.0
+ */
+class WC_Stripe_Email_Failed_Authentication_Retry extends WC_Email_Failed_Order {
+
+	/**
+	 * Constructor
+	 */
+	public function __construct() {
+		$this->id          = 'failed_authentication_requested';
+		$this->title       = __( 'Payment Authentication Requested Email', 'woocommerce-gateway-stripe' );
+		$this->description = __( 'Payment authentication requested emails are sent to chosen recipient(s) when an attempt to automatically process a subscription renewal payment fails because the transaction requires an SCA verification, the customer is requested to authenticate the payment, and a retry rule has been applied to notify the customer again within a certain time period.', 'woocommerce-gateway-stripe' );
+
+		$this->heading = __( 'Automatic renewal payment failed due to authentication required', 'woocommerce-gateway-stripe' );
+		$this->subject = __( '[{site_title}] Automatic payment failed for {order_number}. Customer asked to authenticate payment and will be notified again {retry_time}', 'woocommerce-gateway-stripe' );
+
+		$this->template_html  = 'emails/failed-renewal-authentication-requested.php';
+		$this->template_plain = 'emails/plain/failed-renewal-authentication-requested.php';
+		$this->template_base  = plugin_dir_path( WC_STRIPE_MAIN_FILE ) . 'templates/';
+
+		$this->recipient = $this->get_option( 'recipient', get_option( 'admin_email' ) );
+
+		// We want all the parent's methods, with none of its properties, so call its parent's constructor, rather than my parent constructor.
+		WC_Email::__construct();
+	}
+
+	/**
+	 * Get the default e-mail subject.
+	 *
+	 * @return string
+	 */
+	public function get_default_subject() {
+		return $this->subject;
+	}
+
+	/**
+	 * Get the default e-mail heading.
+	 *
+	 * @return string
+	 */
+	public function get_default_heading() {
+		return $this->heading;
+	}
+
+	/**
+	 * Trigger.
+	 *
+	 * @param int           $order_id The order ID.
+	 * @param WC_Order|null $order Order object.
+	 */
+	public function trigger( $order_id, $order = null ) {
+		$this->object = $order;
+
+		$this->find['retry-time'] = '{retry_time}';
+		if ( class_exists( 'WCS_Retry_Manager' ) && function_exists( 'wcs_get_human_time_diff' ) ) {
+			$this->retry                 = WCS_Retry_Manager::store()->get_last_retry_for_order( wcs_get_objects_property( $order, 'id' ) );
+			$this->replace['retry-time'] = wcs_get_human_time_diff( $this->retry->get_time() );
+		} else {
+			WC_Stripe_Logger::log( 'WCS_Retry_Manager class or does not exist. Not able to send admnin email about customer notification for authentication required for renewal payment.' );
+			return;
+		}
+
+		$this->find['order-number']    = '{order_number}';
+		$this->replace['order-number'] = $this->object->get_order_number();
+
+		if ( ! $this->is_enabled() || ! $this->get_recipient() ) {
+			return;
+		}
+
+		$this->send( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $this->get_attachments() );
+	}
+
+	/**
+	 * Get content html.
+	 *
+	 * @return string
+	 */
+	public function get_content_html() {
+		return wc_get_template_html(
+			$this->template_html,
+			[
+				'order'         => $this->object,
+				'retry'         => $this->retry,
+				'email_heading' => $this->get_heading(),
+				'sent_to_admin' => true,
+				'plain_text'    => false,
+				'email'         => $this,
+			],
+			'',
+			$this->template_base
+		);
+	}
+
+	/**
+	 * Get content plain.
+	 *
+	 * @return string
+	 */
+	public function get_content_plain() {
+		return wc_get_template_html(
+			$this->template_plain,
+			[
+				'order'         => $this->object,
+				'retry'         => $this->retry,
+				'email_heading' => $this->get_heading(),
+				'sent_to_admin' => true,
+				'plain_text'    => true,
+				'email'         => $this,
+			],
+			'',
+			$this->template_base
+		);
+	}
+}