If you receive an error page when trying to checkout please follow the following steps as you are most likely experiencing an issue with your browser:
1) Go to your tools on the browser and click on Internet Options
2) Click on the Advanced Tab
3) Scroll through the settings until you find the Security section
4) Once here make sure the following is checked:

5) Refresh your session and try the payment again.
If you receive an error page when trying to checkout please follow the following steps as you are most likely experiencing an issue with your browser:
1) Go to your tools on the browser and click on Internet Options
2) Click on the Advanced Tab
3) Scroll through the settings until you find the Security section
4) Once here make sure the following is checked:

5) Refresh your session and try the payment again.