I only pay when I receive the bill, I don’t like the monthly increase without respecting the reading. But the debit or credit card payment button is gone. I paid like this all last year.
You can make once off payments into your Bulb Account by going into Payments & Statements and clicking the ‘top up’ button: Bulb account
Let us know if this doesn’t work for you.
– H 
@davide.ferro thanks for raising this! 
The link Holly shared will take you straight to the page you need, and our tech team have had a quick look see and corrected the issue which was causing the top up button to be hidden from you.
It should now be back 