ADM API Refresh Token

Start process:
https://auth.getadministrate.com/oauth/authorize?response_type=code&client_id=gEbFLu6grjhPx5cQKvkRs5hP67xSH0Oa&client_secret=EkGNOs9afvUNXBbsNxroDrtkoCnAcC3y&redirect_uri=https%3A%2F%2Fwww.firstintuition.co.uk%2Fbook-now%2Fadministrate-api-callback%2F