public function legacy_set_total( $amount, $total_type = 'total' ) {
		if ( ! in_array( $total_type, array( 'shipping', 'tax', 'shipping_tax', 'total', 'cart_discount', 'cart_discount_tax' ) ) ) {
			return false;
		}

		switch ( $total_type ) {
			case 'total' :
				$amount = wc_format_decimal( $amount, wc_get_price_decimals() );
				$this->set_total( $amount );
				update_post_meta( $this->get_id(), '_order_total', $amount );
				break;
			case 'cart_discount' :
				$amount = wc_format_decimal( $amount );
				$this->set_discount_total( $amount );
				update_post_meta( $this->get_id(), '_cart_discount', $amount );
				break;
			case 'cart_discount_tax' :
				$amount = wc_format_decimal( $amount );
				$this->set_discount_tax( $amount );
				update_post_meta( $this->get_id(), '_cart_discount_tax', $amount );
				break;
			case 'shipping' :
				$amount = wc_format_decimal( $amount );
				$this->set_shipping_total( $amount );
				update_post_meta( $this->get_id(), '_order_shipping', $amount );
				break;
			case 'shipping_tax' :
				$amount = wc_format_decimal( $amount );
				$this->set_shipping_tax( $amount );
				update_post_meta( $this->get_id(), '_order_shipping_tax', $amount );
				break;
			case 'tax' :
				$amount = wc_format_decimal( $amount );
				$this->set_cart_tax( $amount );
				update_post_meta( $this->get_id(), '_order_tax', $amount );
				break;
		}

		return true;
	}