An integral component of PCI Compliance is your ability to collect credit card details securely. To do so, your web server must have a valid SSL Certificate, which enables your payment transactions to occur through webpages which begin with https:// and which display the lock icon, indicating that data submission is encrypted and secure.
Confirm your web server SSL Certificate expiry date by entering your domain name into an SSL Certificate Checker.
When your certificate has expired, you must obtain a new certificate and install it onto your web server. Your final step is to set the binding, as shown below.
Once your new SSL certificate has been installed on your webserver, this is how to set the bindings in IIS: