public function preview_emails() {

		if ( isset( $_GET['preview_woocommerce_mail'] ) ) {
			if ( ! ( isset( $_REQUEST['_wpnonce'] ) && wp_verify_nonce( sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) ), 'preview-mail' ) ) ) {
				die( 'Security check' );
			}

			// load the mailer class.
			$mailer = WC()->mailer();

			// get the preview email subject.
			$email_heading = __( 'HTML email template', 'woocommerce' );

			// get the preview email content.
			ob_start();
			include 'views/html-email-template-preview.php';
			$message = ob_get_clean();

			// create a new email.
			$email = new WC_Email();

			// wrap the content with the email template and then add styles.
			$message = apply_filters( 'woocommerce_mail_content', $email->style_inline( $mailer->wrap_message( $email_heading, $message ) ) );

			// print the preview email.
			// phpcs:ignore WordPress.Security.EscapeOutput
			echo $message;
			// phpcs:enable
			exit;
		}
	}