Filters the output of radio buttons in Conditional Woo Checkout Field Pro

functions.php

<?php
add_filter( 'cwcfp_radio_input_filter', 'custom_radio_button_field', 10, 4 );
function custom_radio_button_field( $option_key, $option_text, $key, $value ){
	$options = '<label class="radio-input block">' . $option_text . '</label><input type="radio" name="' . $key . '" id="' . $key . '" value="' . $option_key . '" ' . selected( $value, $option_key, false ) . 'class="select">' . $option_text . "\r\n";
	return $options;
}