def clear_cached_authc_info(self, identifier):
msg = "<STR_LIT>".format(identifier)<EOL>logger.debug(msg)<EOL>self.cache_handler.delete('<STR_LIT>' + self.name, identifier)<EOL>
When cached credentials are no longer needed, they can be manually
cleared with this method.  However, account credentials may be
cached with a short expiration time (TTL), making the manual clearing
of cached credentials an alternative use case.

:param identifier: the identifier of a specific source, extracted from
                   the SimpleIdentifierCollection (identifiers)