How to get Apple Card in the mail?

This might be what you are after: Request and activate a titanium Apple Card - Apple Support

Have you applied for a card? Apple Card is a credit card and as such their are financial and legal requirements that you must qualify for your application to be considered.

How to apply for Apple Card - Apple Support

If you’re asking about Apple Gift Card, they can be purchased online directly from Apple or in stores in most parts of the world.

Apple Gift Card - Apple

How could you get a card in the mail