I am trying to connect Quickbooks to update my NATWEST Business credit card account too but it only offers Bankline or online banking as logon options. Neither of which i use. I Have Cardsonline or Clearspend but they do not seem to be supported by Quickbooks!! I have called Natwest but they said i have to sort this out via Quickbooks.. I have uttely no idea what to do now! Next month the cardsonline connection will cease so i want this sorted ASAP.
I have managed to sort this finally....I had exactly the same issue as you.
Firstly you will need to disconnect your credit card account currently connected to Quickbooks....then reconnect...by Add account and ...
Type Cards online in the space and it will offer you different connections...
Click on Cards Online Commercial - Other Cards. The Other Cards one is the only one which will then ask for your log on details correctly...follow this through and you should be able to reconnect again.