public static function get_shipping_tax_rates( $tax_class = null, $customer = null ) {
		// See if we have an explicitly set shipping tax class.
		$shipping_tax_class = get_option( 'woocommerce_shipping_tax_class' );

		if ( 'inherit' !== $shipping_tax_class ) {
			$tax_class = $shipping_tax_class;
		}

		$location          = self::get_tax_location( $tax_class, $customer );
		$matched_tax_rates = array();

		if ( 4 === count( $location ) ) {
			list( $country, $state, $postcode, $city ) = $location;

			if ( ! is_null( $tax_class ) ) {
				// This will be per item shipping.
				$matched_tax_rates = self::find_shipping_rates(
					array(
						'country'   => $country,
						'state'     => $state,
						'postcode'  => $postcode,
						'city'      => $city,
						'tax_class' => $tax_class,
					)
				);

			} elseif ( WC()->cart->get_cart() ) {

				// This will be per order shipping - loop through the order and find the highest tax class rate.
				$cart_tax_classes = WC()->cart->get_cart_item_tax_classes_for_shipping();

				// No tax classes = no taxable items.
				if ( empty( $cart_tax_classes ) ) {
					return array();
				}

				// If multiple classes are found, use the first one found unless a standard rate item is found. This will be the first listed in the 'additional tax class' section.
				if ( count( $cart_tax_classes ) > 1 && ! in_array( '', $cart_tax_classes, true ) ) {
					$tax_classes = self::get_tax_class_slugs();

					foreach ( $tax_classes as $tax_class ) {
						if ( in_array( $tax_class, $cart_tax_classes, true ) ) {
							$matched_tax_rates = self::find_shipping_rates(
								array(
									'country'   => $country,
									'state'     => $state,
									'postcode'  => $postcode,
									'city'      => $city,
									'tax_class' => $tax_class,
								)
							);
							break;
						}
					}
				} elseif ( 1 === count( $cart_tax_classes ) ) {
					// If a single tax class is found, use it.
					$matched_tax_rates = self::find_shipping_rates(
						array(
							'country'   => $country,
							'state'     => $state,
							'postcode'  => $postcode,
							'city'      => $city,
							'tax_class' => $cart_tax_classes[0],
						)
					);
				}
			}

			// Get standard rate if no taxes were found.
			if ( ! count( $matched_tax_rates ) ) {
				$matched_tax_rates = self::find_shipping_rates(
					array(
						'country'  => $country,
						'state'    => $state,
						'postcode' => $postcode,
						'city'     => $city,
					)
				);
			}
		}

		return $matched_tax_rates;
	}