If the pay-as-you-go web hosting is allowed for a plan, Business Manager calculates usage charges - total costs of hosting resources overage - for the plan's subscribers basing on resource usage statistics that Business Manager collects from the connected Plesk servers on a daily basis. No matter what billing mode and billing cycles you use, this happen on the first day of each month: The system finds the average daily overage of each resource except traffic and multiplies it by the month length and the monthly usage price of this resource.
The traffic usage charge is calculated in the following way: Business Manager counts the total traffic overage for a month and multiplies it by the monthly traffic usage price. For example, if subscribers download 10 GB of files during a month while the plan limit is 5 GB, then the traffic overage is 5 GB. Assuming that the traffic usage price is $1 for a 1 GB, such subscribers will pay (10 GB - 5 GB) * $1 = $5 traffic usage fee.
For calculation usage charges for other resources, Business Manager uses the average daily usage values. For example, if a customer uses 500 MB of disk space over the subscription quota for 15 days and then uses extra 700 MB for other 15 days, the average overage will be (500 * 15 + 700 * 15)/30 = 600 MB. If the disk space usage price is $1 for 1 GB, then the customer will pay $0.6 for disk space overage this month.
If a customer purchases additional resources in the middle of a month, then the system subtracts the resource amount provided by the add-on from the daily resource usage of each day starting from the add-on purchasing day.
For example, if a customer uses 500 MB of disk space over the plan limit for a whole month and purchases the add-on that provides an additional 1 GB of disk space on the 7th day of the month, then the usage charge will include the payment for only 7 days of 500 MB of disk space overage.
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