docs: async def build_get_revoc_reg_request(submitter_did: Optional[str],
                                        revoc_reg_def_id: str,
                                        timestamp: int) -> str:
      """
      Builds a GET_REVOC_REG request. Request to get the accumulated state of the Revocation Registry
      by ID. The state is defined by the given timestamp.
  
      :param submitter_did: (Optional) DID of the read request sender (if not provided then default Libindy DID will be used).
      :param revoc_reg_def_id:  ID of the corresponding Revocation Registry Definition in ledger.
      :param timestamp: Requested time represented as a total number of seconds from Unix Epoch
      :return: Request result as json.
      """
  
      logger = logging.getLogger(__name__)
      logger.debug("build_get_revoc_reg_request: >>> submitter_did: %r, revoc_reg_def_id: %r, timestamp: %r",
                   submitter_did, revoc_reg_def_id, timestamp)
  
      if not hasattr(build_get_revoc_reg_request, "cb"):
          logger.debug("build_get_revoc_reg_request: Creating callback")
          build_get_revoc_reg_request.cb = create_cb(CFUNCTYPE(None, c_int32, c_int32, c_char_p))
  
      c_submitter_did = c_char_p(submitter_did.encode('utf-8')) if submitter_did is not None else None
      c_revoc_reg_def_id = c_char_p(revoc_reg_def_id.encode('utf-8'))
      c_timestamp = c_int64(timestamp)
  
      request_json = await do_call('indy_build_get_revoc_reg_request',
                                   c_submitter_did,
                                   c_revoc_reg_def_id,
                                   c_timestamp,
                                   build_get_revoc_reg_request.cb)
  
      res = request_json.decode()
      logger.debug("build_get_revoc_reg_request: <<< res: %r", res)
      return res