post
https://sandbox-api.itsacheckmate.com/oauth/token
In addition to your integration specific credentials, you will also need the short-lived one-time-use code described above in the "Authorisation Request" section in order to get the the initial Access 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 call Response. This will generate a new set of Access Token and Refresh Token for you. Save them securely in your application against the user. Every-time you refresh a token, you will have to use the latest set of Access and Refresh Tokens.