The way I hope it would work would be the same as or close to the way DO does it.
When a client signs up they fund their account with an amount from $5.00 to $500.00 and when they spin up a droplet the hourly billing kicks
in and their funds start ticking down from there on an hourly basis based on a 30 day cycle, when they see their funds getting low they add more to their account. If there is no droplet
or at the time a droplet is deleted the billing stops.