I don't know if it's possible to make a safe deal through credit card - you pay him first and if he doesn't give you the captainship you can cancel the payment but in this case maybe the buyer would cancel the payment after he get the captainship.... so the best way to make an agreement about selling an association or a spot in a platinum is by meeting face to face ( both from same country - you give him the money or charge his account with tokens and he gives you the captainship of the association and if somebody mess up you guys fight .