protected function get_merged_taxes( $in_cents = false, $types = array( 'items', 'fees', 'shipping' ) ) {
		$items = array();
		$taxes = array();

		if ( is_string( $types ) ) {
			$types = array( $types );
		}

		foreach ( $types as $type ) {
			if ( isset( $this->$type ) ) {
				$items = array_merge( $items, $this->$type );
			}
		}

		foreach ( $items as $item ) {
			foreach ( $item->taxes as $rate_id => $rate ) {
				if ( ! isset( $taxes[ $rate_id ] ) ) {
					$taxes[ $rate_id ] = 0;
				}
				$taxes[ $rate_id ] += $this->round_line_tax( $rate );
			}
		}

		return $in_cents ? $taxes : wc_remove_number_precision_deep( $taxes );
	}