private function setDefaultValues($parameters, $fieldMappings, $requestParameters)
 {
     if (empty($requestParameters['merchant_id'])) {
         $parameters['SellerId'] = $this->config->getMerchantId();
     }
     if (array_key_exists('platform_id', $fieldMappings)) {
         if (empty($requestParameters['platform_id']) && !empty($this->config->getPlatformId())) {
             $parameters[$fieldMappings['platform_id']] = $this->config->getPlatformId();
         }
     }
     if (array_key_exists('currency_code', $fieldMappings)) {
         if (!empty($requestParameters['currency_code'])) {
             $parameters[$fieldMappings['currency_code']] = strtoupper($requestParameters['currency_code']);
         } else {
             $parameters[$fieldMappings['currency_code']] = strtoupper($this->config->getCurrencyCode());
         }
     }
     return $parameters;
 }