code: public UnclaimedDraft createUnclaimedDraft(UnclaimedDraft draft) throws HelloSignException {
          String url = BASE_URI;
          if (draft.isForEmbeddedSigning()) {
              url += UNCLAIMED_DRAFT_CREATE_EMBEDDED_URI;
          } else {
              url += UNCLAIMED_DRAFT_CREATE_URI;
          }
          return new UnclaimedDraft(httpClient.withAuth(auth).withPostFields(draft.getPostFields()).post(url).asJson());
      }
docs: Creates an unclaimed draft using the provided request draft object.
  
  @param draft UnclaimedDraft
  @return UnclaimedDraft The created draft
  @throws HelloSignException thrown if there's a problem processing the
  HTTP request or the JSON response.