templates/emails/plain/failed-renewal-authentication-requested.php

<?php
/**
 * Admin email about payment retry failed due to authentication
 *
 * @package WooCommerce_Stripe/Templates/Emails
 * @version 4.3.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

echo '= ' . $email_heading . " =\n\n";

printf(
	// translators: 1) an order number, 2) the customer's full name, 3) lowercase human time diff in the form returned by wcs_get_human_time_diff(), e.g. 'in 12 hours'.
	_x(
		'The automatic recurring payment for order %1$s from %2$s has failed. The customer was sent an email requesting authentication of payment. If the customer does not authenticate the payment, they will be requested by email again %3$s.',
		'In admin renewal failed email',
		'woocommerce-gateway-stripe'
	),
	$order->get_order_number(),
	$order->get_formatted_billing_full_name(),
	wcs_get_human_time_diff( $retry->get_time() )
) . "\n\n";
printf( __( 'The renewal order is as follows:', 'woocommerce-gateway-stripe' ) ) . "\n\n";

echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n";

/**
 * Shows the order details table.
 */
do_action( 'woocommerce_email_order_details', $order, $sent_to_admin, $plain_text, $email );

echo "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n";

/**
* Shows order meta data.
*/
do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text, $email );

/**
* Shows customer details, and email address.
*/
do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );

echo "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n";

echo apply_filters( 'woocommerce_email_footer_text', get_option( 'woocommerce_email_footer_text' ) );