My main bank card expired a little while ago, I've been able to update to my new one for my subscription, but when trying to save my card details for the marketplace it keeps coming up with Error. I've tried filling it in at checkout, but get "Some input fields are invalid". I've tried multiple cards and used both autofill and typed all the information out myself, but I can't work out what the problem is. Never had an issue before and the new cards have been fine everywhere else for the months I've had them. Any idea if the sites having an issue, because I can't see where I'm going wrong? I'm in the UK, if that makes a difference.

So I've figured out the "input fields" error is because one of the fields in my billing address hadn't autofilled for some reason. I'm unfortunately now getting "There was a problem processing your payment" and still can't save my information to my account.

Yeah, neither worked. I've since worked out that they've added "state" to the billing address information, meaning the billing address I was giving had more information than the address with my bank. Not sure why an extra field got added, but I dusted off my old Paypal account and it worked. Thanks for the help though.