A friend of mine in  the USA who has been playing this game   since it first started  finally decided to take the plunge for the first time ever tonight and invest in a few emeralds of  your  Nords game  thinking it was all secure .. 20,000  emeralds for $10  when lo and behold to her surprise  the card which she rarely uses was hacked. Luckily for her the bank intercepted  the attempt and to her further surprise two further attempts were made amounting to $1  and $39. 

Needless  to say the lady will not be buying anything further  from your website after that .. 

I myself only use PayPal... but seeing how easily somebody was able to hack your "supposedly secure " payment process has deterred me from wanting to purchase any further emeralds. 

Just a heads up for you anyway.