I have a few problems. To fill out the security field I have to actually flip the digital card over. To do so requires me to click on something that looks like

I have a few problems. To fill out the security field I have to actually flip the digital card over. To do so requires me to click on something that looks like a close button. It made me feel like clicking on it would invalidate all the card info I had just typed in. When one field is valid that field no longer appears editable, so if there was a mistake in the spelling of my name it took me a minute to figure out I can still click on my name to change it. It doesn't tell me the card number is invalid until after I enter an expiry date, that may be legitimate but it caught me off guard. I don't like it. It's too confusing for what should be name, card number, expiry and security number. It doesn't address the fact that after I fill out those four fields, I still need to enter my billing address in what would be at least four additional fields regardless.