No. You need to be smart and know when to upgrade or downgrade based on your anticipated sales. The service fee (0.25/0.50/0.75 or 1.00) is charged at the time of the sale, based on what plan you are on at that time. In other words, if you are on the On Demand Plan and sell 1,000 tickets, then later upgrade to Professional, you will be charged $1,000 (@ $1/ea) and not the Professional rate. ($0.50).

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