def METHOD_NAME(self, db, patron, hashed_passphrase):
    """Stores the hashed passphrase as a persistent token
    :param db: Database session
    :type db: sqlalchemy.orm.session.Session
    :param patron: Patron object
    :type patron: core.model.patron.Patron
    :param hashed_passphrase: Existing hashed passphrase
    :type hashed_passphrase: string
    """
    self._get_or_create_persistent_token(
        db, patron, DataSource.INTERNAL_PROCESSING, LCPCredentialType.LCP_HASHED_PASSPHRASE.value, hashed_passphrase)