Hi Gwalk,
I just chatted with our billing expert who happens to be in the office today so I can bug her with more questions about this. So the advance payment is still available today, but your balance has to be at zero for the option to appear.
You mentioned you had a zero balance when you tried to do an advance payment, did you ever see the option pop up? If you have a zero balance and no advance payment option showing, can you please send me a screenshot of that?
If you run into any error, please cap that as well.
Thanks!
-Liz
