What role do API keys play in 403 errors?

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Grade: Education Subject: Support
What role do API keys play in 403 errors?
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API keys are frequently involved in 403 errors. An incorrect, expired, or revoked API key will often result in a 403 Forbidden error. The API server uses the key to identify and authenticate the client. If the key is invalid or doesn't grant access to the requested resource, a 403 is returned.