I used to this but I've been using privacy dot com for the last couple of years. Let's you make virtual credit cards. You can set limits by total, monthly, etc. .I have one for 24 hour fitness, I set it you charge my monthly rate and every year they try to charge me a 50 dollar maintenance fee and every year it gets rejected, and they haven't suspended my account yet. Also gave a virtual card to my 16 year old niece for the Apple Store, lets her spend 10 bucks on month on whatever app stuff she needs.

Anyway I've made like 30 cards for stuff, and when I want to cancel I just turn the card off. Easy Peasy.