public static function updateField($field_name)
    {
        $irregular = [
            'get_started' => 'get_started_button_payload',
            'greeting'    => 'greeting_text'
        ];
        
        if ( ! isset($irregular[$field_name])) {
            $field_value = Instance::get($field_name);
        } else {
            $field_value = Instance::get($irregular[$field_name]);
        }
    
        $resource = self::getResourceUrl();
    
        if ( ! empty($field_value) && ! is_null($field_value)) {
            
            $data = [
                $field_name => $field_value
            ];
    
            if ($field_name === 'get_started') {
                $data = [
                    'get_started' => [
                        'payload' => $field_value,
                    ],
                ];
            }
    
            return Request::send($resource, $data);
        }
    
        return self::deleteFields($field_name);
    }