We have received reports of the payment form coming up with the following error:
This error is due to the payment information field being rendered by our third-party tokenization service (Very Good Security, "VGS"). This service replaces all sensitive data with a token before it ever hits our system and is part of our PCI DSS Level 1 Service Provider payment information data flow. Please refer to the Transaction Warehouse PCI Data Flow PDF document attached below for full details.
In more simple terms, you have networks seeing that the page is rendered from our domain name but then detecting that a credit card field is rendered from a different domain name and, under strict rule sets, that is being prohibited.
Some customer have also found success trying to make their payment from their home computers or perhaps take their phone off of Wi-Fi and use their mobile data and try their mobile browser.