How can I make a one-off payment online by debit card?

[MSF]

@Shirley_1176500  Please see: https://help.smarty.co.uk/en/articles/952717-updating-your-payment-method 

[Shirley_1176500]

That doesn’t answer my question, How can I make a one-off payment online by debit card?  I don’t think it’s possible.  The reason I’m asking, my bank will pay me £15 for making a card payment online but the offer closes before my next monthly payment date.

[MSF]

@Shirley_1176500  Web chat with Smarty Support if you cannot find the answer on the help pages.