Planon IoT : IoT Platform - Developer's Guide : Creating an Application – Developer Workflow : Logging In
Logging In
Contact IoT Platform to set up an account for you and then we will send you the credentials you need to log in.
These credentials include the user name and password for logging into the IoT Platform Portal, the IoT Platform Portal URL and the Client ID and Client Secret  properties that are required for each request to the IoT Platform REST API.
This Client ID and Client Secret enable access to the Master Application assigned to this user. The user can then create additional Applications.
See the Login API endpoint for more information.