If you are getting notifications from AdvantageMethod, then your Mac is infected with adware. AdvantageMethod is adware for Mac.
AdvantageMethod changes setting in your Mac. First, AdvantageMethod installs a browser extension in your browser. Then, after AdvantageMethod 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.