docs: async def set_key_metadata(wallet_handle: int,
                             verkey: str,
                             metadata: str) -> None:
      """
      Creates keys pair and stores in the wallet.
  
      :param wallet_handle: Wallet handle (created by open_wallet).
      :param verkey: the key (verkey, key id) to store metadata.
      :param metadata: the meta information that will be store with the key.
      :return: Error code
      """
  
      logger = logging.getLogger(__name__)
      logger.debug("set_key_metadata: >>> wallet_handle: %r, verkey: %r, metadata: %r",
                   wallet_handle,
                   verkey,
                   metadata)
  
      if not hasattr(set_key_metadata, "cb"):
          logger.debug("set_key_metadata: Creating callback")
          set_key_metadata.cb = create_cb(CFUNCTYPE(None, c_int32, c_int32))
  
      c_wallet_handle = c_int32(wallet_handle)
      c_verkey = c_char_p(verkey.encode('utf-8'))
      c_metadata = c_char_p(metadata.encode('utf-8'))
  
      await do_call('indy_set_key_metadata',
                    c_wallet_handle,
                    c_verkey,
                    c_metadata,
                    set_key_metadata.cb)
  
      logger.debug("create_key: <<<")