The billing amount is decided as per the plan you choose, the subscription you select and the number of billable users inside the workspace. If you change any of these parameters, there will be a change in the billable amount.
For instance, consider that you have subscribed to the PRO plan which costs 29$/month/person. Now if after 6 months you add a billable collaborator inside the workspace, then after the completion of the first year’s billing cycle,
The amount will be added in the billing cycle of next year where 29$/month for 6 months will be added for the new contributing member.
In a similar way, if members leave your workspace, the refund will be rewarded to your workspace in BIMcoins which you can use for further transactions.
As per calculations, it will be displayed in the next billing cycle