Currency is Seychelles rupee (SR) and you find it in bills of 10, 20, 25 and 100SR, and coins of 1 and 5SR, 10 and 25 cents.
Exchange is more or less 1 Euro per 6,5SR.
Traveller's checks change in advantageous and credit cards are generally accepted, except some small establishments and most simply shops. You find prices also in dollars and it’s often possible to pay with Euros.