protected function trigger_hook( $old_hook, $new_callback_args ) {
		switch ( $old_hook ) {
			case 'woocommerce_order_add_shipping':
			case 'woocommerce_order_add_fee':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Shipping' ) || is_a( $item, 'WC_Order_Item_Fee' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item );
				}
				break;
			case 'woocommerce_order_add_coupon':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Coupon' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item->get_code(), $item->get_discount(), $item->get_discount_tax() );
				}
				break;
			case 'woocommerce_order_add_tax':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Tax' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item->get_rate_id(), $item->get_tax_total(), $item->get_shipping_tax_total() );
				}
				break;
			case 'woocommerce_add_shipping_order_item':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Shipping' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item->legacy_package_key );
				}
				break;
			case 'woocommerce_add_order_item_meta':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Product' ) ) {
					do_action( $old_hook, $item_id, $item->legacy_values, $item->legacy_cart_item_key );
				}
				break;
			case 'woocommerce_add_order_fee_meta':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Fee' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item->legacy_fee, $item->legacy_fee_key );
				}
				break;
			case 'woocommerce_order_edit_product':
				$item_id  = $new_callback_args[0];
				$item     = $new_callback_args[1];
				$order_id = $new_callback_args[2];
				if ( is_a( $item, 'WC_Order_Item_Product' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item, $item->get_product() );
				}
				break;
			case 'woocommerce_order_update_coupon':
			case 'woocommerce_order_update_shipping':
			case 'woocommerce_order_update_fee':
			case 'woocommerce_order_update_tax':
				if ( ! is_a( $item, 'WC_Order_Item_Product' ) ) {
					do_action( $old_hook, $order_id, $item_id, $item );
				}
				break;
			default:
				do_action_ref_array( $old_hook, $new_callback_args );
				break;
		}
	}