How can I tell if I have an IBKR Lite or IBKR Pro account with IBKR Singapore?

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How can I tell if I have an IBKR Lite or IBKR Pro account?
Can I use the API with an IBKR Lite account?
How do I open an IBKR Lite account with IBKR Singapore?
Can introducing brokers have both IBKR Lite and Pro clients?