Initial commit
diff --git a/includes/compat/class-wc-stripe-email-failed-renewal-authentication.php b/includes/compat/class-wc-stripe-email-failed-renewal-authentication.php
new file mode 100644
index 0000000..64c9f15
--- /dev/null
+++ b/includes/compat/class-wc-stripe-email-failed-renewal-authentication.php
@@ -0,0 +1,113 @@
+<?php
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Failed Renewal/Pre-Order Authentication Notification
+ *
+ * @extends WC_Email_Customer_Invoice
+ */
+class WC_Stripe_Email_Failed_Renewal_Authentication extends WC_Stripe_Email_Failed_Authentication {
+	/**
+	 * Constructor.
+	 *
+	 * @param WC_Email[] $email_classes All existing instances of WooCommerce emails.
+	 */
+	public function __construct( $email_classes = [] ) {
+		$this->id             = 'failed_renewal_authentication';
+		$this->title          = __( 'Failed Subscription Renewal SCA Authentication', 'woocommerce-gateway-stripe' );
+		$this->description    = __( 'Sent to a customer when a renewal fails because the transaction requires an SCA verification. The email contains renewal order information and payment links.', 'woocommerce-gateway-stripe' );
+		$this->customer_email = true;
+
+		$this->template_html  = 'emails/failed-renewal-authentication.php';
+		$this->template_plain = 'emails/plain/failed-renewal-authentication.php';
+		$this->template_base  = plugin_dir_path( WC_STRIPE_MAIN_FILE ) . 'templates/';
+
+		// Triggers the email at the correct hook.
+		add_action( 'wc_gateway_stripe_process_payment_authentication_required', [ $this, 'trigger' ] );
+
+		if ( isset( $email_classes['WCS_Email_Customer_Renewal_Invoice'] ) ) {
+			$this->original_email = $email_classes['WCS_Email_Customer_Renewal_Invoice'];
+		}
+
+		// We want all the parent's methods, with none of its properties, so call its parent's constructor, rather than my parent constructor.
+		parent::__construct();
+	}
+
+	/**
+	 * Triggers the email while also disconnecting the original Subscriptions email.
+	 *
+	 * @param WC_Order $order The order that is being paid.
+	 */
+	public function trigger( $order ) {
+		if ( function_exists( 'wcs_order_contains_subscription' ) && ( wcs_order_contains_subscription( $order->get_id() ) || wcs_is_subscription( $order->get_id() ) || wcs_order_contains_renewal( $order->get_id() ) ) ) {
+			parent::trigger( $order );
+
+			// Prevent the renewal email from WooCommerce Subscriptions from being sent.
+			if ( isset( $this->original_email ) ) {
+				remove_action( 'woocommerce_generated_manual_renewal_order_renewal_notification', [ $this->original_email, 'trigger' ] );
+				remove_action( 'woocommerce_order_status_failed_renewal_notification', [ $this->original_email, 'trigger' ] );
+			}
+
+			// Prevent the retry email from WooCommerce Subscriptions from being sent.
+			add_filter( 'wcs_get_retry_rule_raw', [ $this, 'prevent_retry_notification_email' ], 100, 3 );
+
+			// Send email to store owner indicating communication is happening with the customer to request authentication.
+			add_filter( 'wcs_get_retry_rule_raw', [ $this, 'set_store_owner_custom_email' ], 100, 3 );
+		}
+	}
+
+	/**
+	 * Returns the default subject of the email (modifyable in settings).
+	 *
+	 * @return string
+	 */
+	public function get_default_subject() {
+		return __( 'Payment authorization needed for renewal of {site_title} order {order_number}', 'woocommerce-gateway-stripe' );
+	}
+
+	/**
+	 * Returns the default heading of the email (modifyable in settings).
+	 *
+	 * @return string
+	 */
+	public function get_default_heading() {
+		return __( 'Payment authorization needed for renewal of order {order_number}', 'woocommerce-gateway-stripe' );
+	}
+
+	/**
+	 * Prevent all customer-facing retry notifications from being sent after this email.
+	 *
+	 * @param array $rule_array   The raw details about the retry rule.
+	 * @param int   $retry_number The number of the retry.
+	 * @param int   $order_id     The ID of the order that needs payment.
+	 * @return array
+	 */
+	public function prevent_retry_notification_email( $rule_array, $retry_number, $order_id ) {
+		if ( wcs_get_objects_property( $this->object, 'id' ) === $order_id ) {
+			$rule_array['email_template_customer'] = '';
+		}
+
+		return $rule_array;
+	}
+
+	/**
+	 * Send store owner a different email when the retry is related to an authentication required error.
+	 *
+	 * @param array $rule_array   The raw details about the retry rule.
+	 * @param int   $retry_number The number of the retry.
+	 * @param int   $order_id     The ID of the order that needs payment.
+	 * @return array
+	 */
+	public function set_store_owner_custom_email( $rule_array, $retry_number, $order_id ) {
+		if (
+			wcs_get_objects_property( $this->object, 'id' ) === $order_id &&
+			'' !== $rule_array['email_template_admin'] // Only send our email if a retry admin email was already going to be sent.
+		) {
+			$rule_array['email_template_admin'] = 'WC_Stripe_Email_Failed_Authentication_Retry';
+		}
+
+		return $rule_array;
+	}
+}