How to pay via PayPal:
1) Enter your Nickname
2) Choose platinum amount you wish to buy
3) Choose your dealer/trader in Dealer-box
4) Press "Platinum purchase" button
5) Put your details
6) After you sent money, in game you recive platinum.
If you use echeck, then platinum recive, only after your bank cleared this echeck.
switch between echeck and normal payments you can like on this Screen