PayPal is the quick and safe way to pay. Your bank account and credit card details are only stored in PayPal's database, thus there is no need to send these information each time you purchase goods via the internet.
After completing the order you will be automatically redirected to PayPal, where you can make the final payment. You can also pay with your credit card using PayPal!
Further information on fees, terms and conditions is available on PayPal's website.