code: protected function loadAvailabilityOptions($availabilityOptions)
      {
          if (!empty($availabilityOptions)) {
              foreach ($availabilityOptions as $type => $argument) {
                  $this->availabilityOptions->optionInfo[] = new OptionInfo($type, $argument);
              }
          }
      }
docs: Availability options:
  Keys are option types (RequestOptions::OPTION_TYPE_*),
  values are option arguments.
  
  @param $availabilityOptions