code: public void marshall(UpdateChapCredentialsRequest updateChapCredentialsRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (updateChapCredentialsRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(updateChapCredentialsRequest.getTargetARN(), TARGETARN_BINDING);
              protocolMarshaller.marshall(updateChapCredentialsRequest.getSecretToAuthenticateInitiator(), SECRETTOAUTHENTICATEINITIATOR_BINDING);
              protocolMarshaller.marshall(updateChapCredentialsRequest.getInitiatorName(), INITIATORNAME_BINDING);
              protocolMarshaller.marshall(updateChapCredentialsRequest.getSecretToAuthenticateTarget(), SECRETTOAUTHENTICATETARGET_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.