public function __construct() {
			$this->id             = 'customer_on_hold_order';
			$this->customer_email = true;
			$this->title          = __( 'Order on-hold', 'woocommerce' );
			$this->description    = __( 'This is an order notification sent to customers containing order details after an order is placed on-hold.', 'woocommerce' );
			$this->template_html  = 'emails/customer-on-hold-order.php';
			$this->template_plain = 'emails/plain/customer-on-hold-order.php';
			$this->placeholders   = array(
				'{order_date}'   => '',
				'{order_number}' => '',
			);

			// Triggers for this email.
			add_action( 'woocommerce_order_status_pending_to_on-hold_notification', array( $this, 'trigger' ), 10, 2 );
			add_action( 'woocommerce_order_status_failed_to_on-hold_notification', array( $this, 'trigger' ), 10, 2 );
			add_action( 'woocommerce_order_status_cancelled_to_on-hold_notification', array( $this, 'trigger' ), 10, 2 );

			// Call parent constructor.
			parent::__construct();
		}