Make sure you log out during the payment. Log back in after the payment is succesfull to obtain your G-Coin.
Use the same e-mail adres as you have used creating your account else you will not recieve the G-Coin.
After the official release the G-Coin you spend will be refunded as G-coin to spend afer the release. Only 50% of the G-coin will be refunded. You will be rewarded with something special to thank you for helping us, we will release more info about this soon.
We appreciate the orders, it is something we need to keep the servers running. You make it possible for us to keep on working on the game and steadily make this the best SF to ever exist. So from the SF team, thanks for supporting us!