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The API being completely separate from ChatGPT and subscriptions includes paying separately for services.
If it is the application reporting the issue, it may expect a key to be stored in an OS environment variable OPENAI_API_KEY.
Obsolete software also may try to improperly validate a key, while the key format and length has also been changed.
Determine if it is a 403 server error or other problems with your authentication usage by the software.
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