Alright, I doublechecked my back information and I think I found the wrong information I provided, the CVC number.
However now when I submit the CVC number. The page keeps loading for a while before simply staying on that page and failing to load.
Refreshing or moving away from the page and then retrying doesn't bring up the page to enter my CVC number again. So I'm not sure if the information got through correctly.
After that I have the same issue again with trying to resubmit the order. WIth not going past the last part of checkout.