docs: public void marshall(AccessKeyDetails accessKeyDetails, ProtocolMarshaller protocolMarshaller) {
  
          if (accessKeyDetails == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(accessKeyDetails.getAccessKeyId(), ACCESSKEYID_BINDING);
              protocolMarshaller.marshall(accessKeyDetails.getPrincipalId(), PRINCIPALID_BINDING);
              protocolMarshaller.marshall(accessKeyDetails.getUserName(), USERNAME_BINDING);
              protocolMarshaller.marshall(accessKeyDetails.getUserType(), USERTYPE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }