But financial experts say that the product is expensive, it has many conditions to qualify for coverage, and it often does not pay off. In many cases, insurance only covers the minimum monthly payment, not all assets. The Joker Prepaid Mastercard can be used wherever Mastercard is accepted. To use the card at a point-of-sale terminal, simply slide the magnetic strip to the back of the card and sign the receipt. Each time the prepaid card is used, the amount of the purchase, including taxes and other fees, is deducted from the available credit until this credit is zero. Once the total amount of the card has been spent, it can no longer be used as a means of payment. If you`re Canadian, you`ve probably done your shopping at Canadian Tire. .