Whilst processing your payment, your computer's and the server's connection are secured by the HTTP protocol.
The majority of Web navigators have a padlock logo in the corner of the screen, to let you know that it is a secured connection.
The "s" showing after the "http" shows that the connection between the computer and the payment's servers quantified by the SSL protocol. If a pirate interceptes any data, he will only be able to see an indecipherable list of symbols.
In any case, if you come across any problem, please get in touch with us and we will help you through the process.