Karizanta's financial system is like this.
You order a service and X amount is received from you when ordering, this amount is considered as the initial credit for the hourly service.
Your hourly service will use this amount as credit and issue you a new invoice when it is about to end.
If you have credit on the website, it will be used to pay the hourly service invoice, and if you don't have credit, you should pay the invoice through bank portals.
If you do not pay the X amount that is in the invoice, your service will be suspended and your service will not be activated until the invoice is paid.
It is suggested that you always have credit on the main website so that you can use this amount if you need to pay for the hourly service.