def UnpackStatKey(stat_key):
  """Helper to unpack hashable dictionary key that can be json serialized.

  Args:
    stat_key: String key created by PackStatKey().

  Returns:
    Tuple of strings:
    -client_id: String, possibly with spaces, of the domain issued a token.
    -scope: String with no spaces reflecting the scope of access granted.
  """
  return stat_key.split(None, 1)