docs: def init_auth(username, password):
      """Initializes the auth settings for accessing MyAnimeList
      through its official API from a given username and password.
      :param username Your MyAnimeList account username.
      :param password Your MyAnimeList account password.
      :return A tuple containing your credentials.
      """
      username = username.strip()
      password = password.strip()
      credentials = (username, password)
      if helpers.verif_auth(credentials, header):
          return credentials
      else:
          raise ValueError(constants.INVALID_CREDENTIALS)