Can I use IBKR's APIs with my paper account?

IBKR's Web API and TWS API can be used with IBKR paper accounts with minimal differences in functionality compared to live use. Paper trades are executed by the same simulator employed by IBKR's own platforms.

FIX integrations can be tested via QA sessions configured by our FIX Engineering team.

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How do I get API access?
How do I change the password on my paper account?
Where can I find the API documentation?
How can I download option chain historical data with API?