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A Box Sign request, that has not yet been signed or declined, can be cancelled using the . Any outstanding signers will no longer be able to sign the document. Only the user who created the request, the requester, is able to cancel it. A request cannot be cancelled if it was declined, fully signed, or the document is still converting. 
curl -i -X POST "https://api.box.com/2.0/sign_requests/<SIGN_REQUEST_ID>/cancel" \
     -H "authorization: Bearer <ACCESS_TOKEN>"