...
The REST API URL: https://server.superoffice.com/Cust12345/api/v1/ (server and 12345 will differ from customer to customer)
The Client ID is obtained as described in What is my client ID?
The Client Secret is obtained as described in Create a new client secret
The username and password of the SuperOffice user
Step 5 - Obtain Tenant Permission
Contact SuperOffice to have them grant tenant permission for your production environment