i asked same question to their custom support last time.
heres the answer
You are welcome to play on Winamax from any location where the local legislation permits you to play on an online poker site licenced in France.
You must own a payment method supplied by a payment service established in a member state of the European Commonwealth or a state which is a part of an economic agreement with Europe (including France) with a clause in the agreement for administrative assistance to fight fraud and tax evasion.
You should verify with your bank whether your country fits into these parameters.