code: def b64_decode(data: bytes) -> bytes:
      
      missing_padding = len(data) % 4
      if missing_padding != 0:
          data += b'=' * (4 - missing_padding)
      return urlsafe_b64decode(data)
docs: :param data: Base 64 encoded data to decode.
      :type data: bytes
      :return: Base 64 decoded data.
      :rtype: bytes