accessibletemplate.com does not store your payment data: after the creation of a new order you will be redirected to the Paypal website, only then you will include your credit card / paypal credentials. After the payment you are redirected back to accessibletemplate.com, so that your payment information is kept secret only between you and Paypal.
If you want the most secure way to pay then select the "bank transfer" payment. You will receive the payment information after the order is created.
Every time you login to our website the SSL protocol is activated for the connection. ssllabs.com rated our website as "A-" and stated that it is not vulnerable to the "Heartbleed attack".