Leave it to Apple to create a whole new accessories category. Credit card cases. Adrian Kingsley-Hughes:
Apple goes into great detail on how to keep your flashy laser-etched titanium Apple Card looking its finest. Store it in “a wallet, pocket, or bag made of soft materials,” don’t store it with another credit card because it might become scratched, and give it the occasional clean with a “soft, slightly damp, lint-free microfiber cloth.”
Apple has instructions on how to do it right. Look for Apple Card cases on Amazon soon.