There are two types of currencies in circulation in Cuba. The Cuban peso (CUP) concerns only Cubans who use it in their everyday life to pay for example their rent, car etc. The convertible peso (CUC) is used by tourists, everything is paid in CUC if you do not think outside the box. Neither of these two currencies is exportable. Since October 2019, American money has been accepted in shops and people can now open accounts in dollars. However, it is best to bring Canadian money and exchange it on the spot for convertible pesos. Most credit cards issued by a non-US financial institution are accepted. It's best to check with your bank to make sure your credit card will be accepted in Cuba. Debit cards bearing the Visa or Mastercard logo are accepted. However, in an AMT, only cards with the Visa logo will work.