public function is_available( $package ) {
		if ( 'no' === $this->enabled ) {
			return false;
		}

		if ( 'specific' === $this->availability ) {
			$ship_to_countries = $this->countries;
		} else {
			$ship_to_countries = array_keys( WC()->countries->get_shipping_countries() );
		}

		if ( is_array( $ship_to_countries ) && ! in_array( $package['destination']['country'], $ship_to_countries, true ) ) {
			return false;
		}

		// Enabled logic.
		$is_available       = false;
		$has_coupon         = false;
		$has_met_min_amount = false;

		if ( in_array( $this->requires, array( 'coupon', 'either', 'both' ), true ) ) {
			$coupons = WC()->cart->get_coupons();

			if ( $coupons ) {
				foreach ( $coupons as $code => $coupon ) {
					if ( $coupon->is_valid() && $coupon->get_free_shipping() ) {
						$has_coupon = true;
					}
				}
			}
		}

		if ( in_array( $this->requires, array( 'min_amount', 'either', 'both' ), true ) ) {
			$total = WC()->cart->get_displayed_subtotal();

			if ( WC()->cart->display_prices_including_tax() ) {
				$total = round( $total - ( WC()->cart->get_discount_total() + WC()->cart->get_discount_tax() ), wc_get_price_decimals() );
			} else {
				$total = round( $total - WC()->cart->get_discount_total(), wc_get_price_decimals() );
			}

			if ( $total >= $this->min_amount ) {
				$has_met_min_amount = true;
			}
		}

		switch ( $this->requires ) {
			case 'min_amount':
				if ( $has_met_min_amount ) {
					$is_available = true;
				}
				break;
			case 'coupon':
				if ( $has_coupon ) {
					$is_available = true;
				}
				break;
			case 'both':
				if ( $has_met_min_amount && $has_coupon ) {
					$is_available = true;
				}
				break;
			case 'either':
				if ( $has_met_min_amount || $has_coupon ) {
					$is_available = true;
				}
				break;
			default:
				$is_available = true;
				break;
		}

		return apply_filters( 'woocommerce_shipping_' . $this->id . '_is_available', $is_available, $package, $this );
	}