WooCommerce: Allow Free Shipping up to Certain Amount

wc-allow-free-shipping-up-to-max-amount

add_filter( 'woocommerce_shipping_free_shipping_is_available', 'prefix_is_available_up_to_max_amount', 10, 3 );
/**
 * @param bool                      $is_available
 * @param array                     $package Shipping package.
 * @param WC_Shipping_Free_Shipping $shipping_class
 * @return bool
 */
function prefix_is_available_up_to_max_amount( $is_available, $package, $shipping_class ) {
	$max_amount = 200;
	$total = WC()->cart->get_displayed_subtotal();
	
	if ( 'incl' === WC()->cart->tax_display_cart ) {
		$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 >= $max_amount ) {
		$is_available = false;
	}
	return $is_available;
}