post
https://sandbox-api.itsacheckmate.com/oauth/token
The Access token expires in 24 hours by default. Before your access token has expired, you can use this API to issue a new Access token using your refresh token. The refresh token must be the same that you received in the Get Access token API.This will generate a new set of Access token and Refresh token for you. Save them securely in your application against the user. Everytime you refresh a token, you will have to use the latest set of access and refresh tokens.