If you are getting notifications from PortalFlow, then your Mac is infected with adware. PortalFlow is adware for Mac.
PortalFlow changes setting in your Mac. First, PortalFlow installs a browser extension in your browser. Then, after PortalFlow hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.