Fake card details for suspicious sites!
On the Internet there are often sites that ask for payment card details for registration or access to free functionality: “We won’t take anything off, but you have to enter your card anyway” — everything is fine until they charge you for the subscription.
Test credit card generators are useful for such cases.
Card Generator (https://cardgenerator.org/) or Prepostseo (https://www.prepostseo.com/tool/credit-card-generator) — in this service you can choose a payment system (Visa, MasterCard, etc.), and the second service will even let you choose a bank and set your own CVV code. Service will also create a random address and zip code