def combine_submissions(options)
      unless options[:submission_ids].is_a?(::Array)
        raise InvalidDataError, "submission_ids is required, and must be an Array."
      end
      options[:source_pdfs] = options[:submission_ids].map do |id|
        { type: 'submission', id: id }
      end
      options.delete :submission_ids

      combine_pdfs(options)
    end
def combine_submissions(options)
      unless options[:submission_ids].is_a?(::Array)
        raise InvalidDataError, "submission_ids is required, and must be an Array."
      end
      options[:source_pdfs] = options[:submission_ids].map do |id|
        { type: 'submission', id: id }
      end
      options.delete :submission_ids

      combine_pdfs(options)
    end
Alias for combine_pdfs, for backwards compatibility