WooCommerce Extra Checkout Fields for Brazil - Neighborhood required

functions.php

<?php
function custom_wcbcf_billing_fields( $fields ) {
	$fields['billing_neighborhood']['required'] = true;

	return $fields;
}

add_filter( 'wcbcf_billing_fields', 'custom_wcbcf_billing_fields' );

function custom_wcbcf_shipping_fields( $fields ) {
	$fields['shipping_neighborhood']['required'] = true;

	return $fields;
}

add_filter( 'wcbcf_shipping_fields', 'custom_wcbcf_shipping_fields' );