The invoice is sent the same day of the charging. It occurs each month on the anniversary date of your registration.
For example if you create an account today, you will be charged every 22nd on the month.
Your consumption of hours is billed at the end of the month based on the number of hours you uploaded on api.video. But if you subscribe to a premium or business plan, the amount of the subscription is charged in advance.
If you need more specific information about your account you an reach us on the api.video chat.