Buying SaaS: Simplified
You are on a vendor's website. They are asking you for payment. The NachoNacho browser extension will pop down automatically. Create a new card or find an existing card. Copy the card details and pay the vendor. Without ever leaving the vendor's site!
One card per vendor
Pay every vendor with a separate virtual credit card. Put tight spending limits. Even set your own expiry date. Suspend or cancel the card at will. Never make unwanted payments. Never overpay. Never pay for a 'free trial'.