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All requests to the token endpoint return various standard HTTP headers, including the response status code, and a response body in JSON format.

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HTTP/1.1 CODE MESSAGE
Content-Type: application/json; charset=utf-8
Content-Length: 7

The response body contains either the requested information or an error message:

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{
  "error": "invalid_scope",
  "error_description": "\"newvoicemediavonage/api/stats\" is an invalid scope"
}

...