public function is_available( $package ) {
		$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;
						break;
					}
				}
			}
		}

		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 = $total - WC()->cart->get_discount_tax();
			}

			if ( 'no' === $this->ignore_discounts ) {
				$total = $total - WC()->cart->get_discount_total();
			}

			$total = round( $total, wc_get_price_decimals() );

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

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

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