I am trying to pay my member fee with a card and I am getting the following error:
Single Sign-On Error
We can't log you in. Check for an invalid assertion in the SAML Assertion Validator (available in Single Sign-On Settings) or check the login history for failed logins.
Sorry to pile on - I too am having the exact same problem. Just passed the exam and can't pay my fee!
If you can help I'd be extremely appreciative