How to add additional fields at checkout

add_filter('evotx_checkout_additional_fields_settings','evotx_2',10,1);
function evotx_2($fields){
	$fields['business'] = __('Business Name','evotx');
	// you can add other fields like this similarly
	return $fields;
}

add_filter('evotx_additional_ticket_info_fields', 'evotx_1', 10,1);
function evotx_1($fields){
	// additonal field code block
	$fields['business'] = array(
		'type'=>'text',
		'label'=> evo_lang('Business Name'),
		'required'=> false,
	);
	// you can use same code block for more fields
	return $fields;
}

add_filter('evotx_get_attendees_for_event', 'evotx_3',10, 3);
function evotx_3($arr, $event_id, $_th){

	if(!isset($_th['business'])) return $arr;
	$arr['oD']['business'] = $_th['business'];

	// the above 2 lines can be used for all other new fields

	return $arr;
}

add_filter('evotx_confirmation_email_additional_data_array','evotx_4', 10, 4);
function evotx_4(  $array, $_this_ticket , $TIX_CPT, $EVENT ){

	if( empty( $_this_ticket['oD']['business'] )) return $array;

	$array['business'] = array(
		'label'=> evo_lang('Business Name'),
		'value'=> $_this_ticket['oD']['business']
	);

	return $array;
}