code: public function extract($soapResponse)
      {
          $messageBody = null;
  
          $messageBody = $this->getStringBetween($soapResponse, '<SOAP-ENV:Body>', '</SOAP-ENV:Body>');
  
          if (empty($messageBody) || false === $messageBody) {
              $messageBody = $this->getStringBetween($soapResponse, '<soap:Body>', '</soap:Body>');
          }
  
          return $messageBody;
      }
docs: Extracts the message content from the soap envelope (i.e. everything under the soap body)
  
  @param string $soapResponse
  @return string|null