Integrate Sophos XG Firewall with Auth0

I have the below workflow 

1. User will connect to a public network
2. User will be redirected to a landing page provided by Sophos XG
3. User will click on “login” button on landing page
4. He wil be redirected to Auth0 login page
5. Where user will login using social accounts
6. Once user logs in Auth0, Auth0 will authenticate user and capture user’s data
7. Auth0 will then send an API query asking sophos firewall to grant internet access to user

the major part that I am actually needing help is the API query that instruct XG firewall to give internet access to the Auth0 user

Any help please