code: public static function getConfigDefinitions()
      {
          $definitions = parent::getConfigDefinitions();
  
          return $definitions + [
              'affiliateCampaignId' => [
                  'valid' => ['string']
              ],
              'affiliateReferenceId' => [
                  'valid' => ['string']
              ],
              'apiVersion' => [
                  'valid' => ['string'],
                  'default' => \DTS\eBaySDK\Browse\Services\BrowseService::API_VERSION,
                  'required' => true
              ],
              'authorization' => [
                  'valid' => ['string'],
                  'required' => true
              ],
              'contextualLocation' => [
                  'valid' => ['string']
              ],
              'marketplaceId' => [
                  'valid' => ['string']
              ]
          ];
      }
docs: Returns definitions for each configuration option that is supported.
  
  @return array An associative array of configuration definitions.