Fair Exact Billing in Following Month
On the day of the actual upgrade or downgrade there will be no additional charge.
On the payment day for the following month, however, the system will check which plans were active for how many days in the month before, in order to adjust the charge up or down accordingly.
The plans can therefore be switched flexibly at all times.
Plan A is booked on 1.4.2017 for 100$.
On 15.4.2017 the account is upgraded to Plan B, which costs 200$. At this time there is no additional payment though.
At the start of the next monthly cycle (here 1.5.2017), the system checks how many days Plan A and B were active in the previous month. In this case the billing for May will look as follows:
100$ for the coming month (May)
+ 100$ for 15 Days of Plan B in April (200 / 30 x 15 = 100)
- 50$ for 15 Days, in which (the already paid) Plan A was not used in April (100 / 30 x 15)
= a total of 150$ for May's charge