One off payment with credit card

Hi all, I want to make a one off payment with my credit card to top my account up, but there doesn’t seem to be an option to do this on the website or app… is this possible? I can use my current account but ideally prefer not to

In the Payments and Statements section of your Bulb dashboard there’s an option to “Top up balance” in a green box under the most recent entry in your statement. Not if you’re a prepay customer though (as far as I know):