Can I pass the card fee to my customers?

Yes — an optional Settings toggle adds a disclosed card fee, shown as its own line. It applies to credit cards only: there is no fee on debit or prepaid cards, or on a bank transfer (ACH). It is capped at 3% of the payment and never more than Stripe charges (2.9% + $0.30 per transaction) — set it lower any time. Check your state's rules before turning it on, since some states restrict surcharges.