filter_package_rates.php

	public static function filter_package_rates( $package_rates, $package ) {

		$chosen_methods = WC()->session->get( 'chosen_shipping_methods' );

		if ( 'none' != WC_Subscriptions_Cart::$recurring_cart_key ) {

			// get all the shipping methods chosen for this recurring cart key
			$recurring_cart_shipping_methods = array();

			foreach ( $chosen_methods as $index => $method ) {
				// we need to trim  the trailing _0 off the index to compare against the recurring cart key
				if ( WC_Subscriptions_Cart::$recurring_cart_key == substr( $index, 0, -2 ) ) {
					$recurring_cart_shipping_methods[] = $method;
				}
			}

			if ( 0 < count( $recurring_cart_shipping_methods ) ) {
				foreach ( $package_rates as $shipping_method_id => $rate ) {
					if ( ! in_array( $shipping_method_id, $recurring_cart_shipping_methods ) ) {
						unset( $package_rates[ $shipping_method_id ] );
					}
				}
			}
		}

		return $package_rates;
	}