Coupon Restriction option in WooCommerce Smart COD Plugin

gistfile1.txt

add_filter( 'wc_smart_cod_available', 'cod_restrict_coupons' );

function cod_restrict_coupons( $is_cod_available ) {
	global $woocommerce;
	$applied_coupons = $woocommerce->cart->applied_coupons;
	
	// add the coupon codes you want
	// to restrict in this array

	$restricted_coupons = array(
		'hi5',
		'pre2'
	);
	
	if( array_intersect( $restricted_coupons, $applied_coupons ) ) {
		$is_cod_available = false;
	}
	
	return $is_cod_available;
	
}