You can very easily integrate your puresilva website to Google Checkout, Protx, Paypal and Nochex payment providers. You can connect to all 3 to give your customers a range of payment choices.
You just need to make sure you have an account with one of the payment providers first in order to connect your website to it - once you have, integration is as easy as entering your email address/userID for the payment provider in the backoffice.
Paypal and Nochex both use 'call-back' procedures to prevent spoof ordering Protx use encryption. Google Checkout is also secured via SSL. In fact, all take payment on web-pages with an SSL (secure socket layer) certificate so your customer's details are encrypted and secure.
The full details of each payment provider's security measures are available at their respective websites:-
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