Contact the nearest embassy for that. If you don't, you could lose your seat. Visitors entering and leaving the country are subject to strict currency control. All foreign currency must be declared on arrival on the country. This is recorded on a currency declaration form which must be presented to the bank for stamping whenever foreign currency is exchanged or spent.
Credit cards are of limited use in Madagascar.
But you can take cash with them through the different bank. No vaccination is necessary. But if you arrive from an infected area, you must be vaccinated against yellow fever, typhoid or cholera. Antimalarials are generally advised. Contact your doctor before traveling.