The Vision Rest Login Helper
To enable your check in screen to communicate with Vision via the REST, you'll need to log in via the Vision Rest Login Helper, this can be found in the "Your Account" section, which can be reached by click the blue face icon in the right hand corner.
Under "My Account" click on "Clinical Integration" and you'll be presenting with the button to "Link my Vision account"
Simply click "link my Vision account" and it will open the Vision Login Helper in a new window, log in with your normal Vision login, being sure to select your country and region and tick the "Keep me signed in" box to stay connected.
After you sign in, the window will close and you'll see your account is now connected, at this point the green "connected" icon should appear at the top left and then you're all set.