If you wish to make online, mail, or telephone order purchases, you should go to jokercard.ca to register your card. Unless you register your card in advance, there may be no way an online, mail, or telephone order merchant can confirm your identity.
The Joker's use varies greatly. Many card games omit the cards entirely; as a result, Jokers are sometimes used as informal replacements for lost or damaged cards in a deck by simply noting the lost card's rank and suit on the Joker.