Using the renewAccessToken function

How do I use the renewAccessToken function in the PHP API to renew the access token?

I tried the following cURL on the command line:
curl -s \
-H "X-Kite-Version: 3" \
-d "api_key=" \
-d "refresh_token=" \
-d "checksum=sha256( api_key + access token + api secret )"
It says "Token is invalid or has expired", but the token is still valid and I can very well send quote requests with it.
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