Your personal details (containing address, credit card number, bank account etc) are codified with a connection of 128/256 bit SSL. Unauthorized people will not have access to this kind of information.
SilverBrand.gr does not have access to your bank data and information that are relevant to banks, and credit card nnumbers are not stored.
Your personal information such as your name or email address are only used to achieve the best possible deals and to contact you as well, for the campaigns of SilverBrand.gr.