docs: public void marshall(SigningJob signingJob, ProtocolMarshaller protocolMarshaller) {
  
          if (signingJob == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(signingJob.getJobId(), JOBID_BINDING);
              protocolMarshaller.marshall(signingJob.getSource(), SOURCE_BINDING);
              protocolMarshaller.marshall(signingJob.getSignedObject(), SIGNEDOBJECT_BINDING);
              protocolMarshaller.marshall(signingJob.getSigningMaterial(), SIGNINGMATERIAL_BINDING);
              protocolMarshaller.marshall(signingJob.getCreatedAt(), CREATEDAT_BINDING);
              protocolMarshaller.marshall(signingJob.getStatus(), STATUS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }