The way our service works is that you pay for two aspects:
We charge you for your subscription for the following month. Your first invoice reflects what you will pay for the following month subscription to use our service.
At the end of each month, you pay for the previous month's clickthrough charges. The 2nd invoice you will receive from us will contain clickthrough charges if they exceed 2000 per month.
Your first invoice will always be for just the base fee, and if, for some reason, you were to terminate your account, the last month would be for just clickthrough fees. (No $35.99.)
An example would be: