When do I need to pay market data fees?

Market data and research subscription fees are assessed beginning on the day of subscription and billed within the first three U.S. business days of each subsequent month for as long as the services are active.

Additional Information

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Are market data fees prorated?
If I cancel subscription will I receive data through end of month?
I have just opened my account. Why can't I see market data?
Why was my account double charged market data fees?