What are some common reasons why an 'error 403' might occur when interacting with the Gmail API?

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Grade: Education Subject: Support
What are some common reasons why an 'error 403' might occur when interacting with the Gmail API?
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Common reasons include: insufficient permissions (you don't have the required API access), incorrect API key or secret, invalid API endpoint, or a rate limit exceeded. Also, ensure you're using the latest version of the Gmail API client library.