How do you use a no KYC virtual debit card funded with crypto?

I’m trying to pay for a couple online subscriptions next month without moving money back through my bank or logging into an exchange.

I’ve seen these no-kyc virtual cards setups where you fund on-chain and get a card number pretty fast, but I’ve never used one before and don’t wanna mess up the first load or get declined everywhere.

For anyone who’s done it, what’s the actual step-by-step from wallet to making the first payment and what should I watch out for with fees, refunds, or merchants flagging it?