In short: cloud is metered by the hour and invoiced at the end of the month. Your balance is no longer a brake for what is already running: your resources keep running after it reaches zero, and you are billed for what they used. Creating a new resource, or making one bigger, needs a balance that covers its first month until your account has paid two invoices; after that it does not. If you hold credit, the invoice is paid from it the moment it is raised and you never hear about any of this.
Everything else on RareCloud, VPS, web hosting, proxies and domains, is bought for a period and paid at order. None of this applies to them.
When the bill arrives
At the end of each month, for the cloud you used that month. Until your account has paid us twice you also get one in the middle of the month, for the month so far. Anything under 5 EUR waits and joins your next bill.
If your account holds credit or bonus, the invoice is settled from it immediately. Credit that arrives later settles an outstanding invoice on its own, within the hour.
If a bill is not paid
The invoice is due on the day it is issued, because you have already had the service. What you get is a week to pay it.
Seven days later, at 09:00 in your own time zone, your cloud resources are powered off. They are stopped, not deleted, and nothing is lost. Paying brings them back, and while a bill is past due you cannot create new cloud resources.
Fourteen days later they are deleted, permanently. You are warned before that, and nothing is ever deleted without a final notice. Like every other service here, a resource is billed while it exists, including while it is stopped, so delete what you no longer need.