I put all of my subscriptions on single purpose card numbers I generate using www.privacy.com The tool lets me set a total or per month spending limit on each

I put all of my subscriptions on single purpose card numbers I generate using www.privacy.com The tool lets me set a total or per month spending limit on each card, which I can use to decline unexpected transactions -- basically either auto billing that kicks in after a trial, or price increases that I never noticed. It also gives me a convenient place to see all of my active subscriptions.