What are common causes of 400 errors when using UrlFetchApp in Google Sheets?

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Grade: Education Subject: Support
What are common causes of 400 errors when using UrlFetchApp in Google Sheets?
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Common causes for 400 errors with UrlFetchApp include sending invalid JSON data in the request body, incorrect HTTP method usage (e.g., POSTing to an endpoint that expects GET), missing or malformed API keys, exceeding character limits in query parameters, or providing invalid values for specific API fields.