To be able to gain access to Geovisualization services, you need to carry out the following preliminary steps:
Get a HERE Account
To access Geovisualization, go to https://account.here.com/sign-up and sign up for a HERE account
Get a HERE Plan
When you have an account, register for a 90-day Free Trial plan on the HERE website: https://developer.here.com/plans.
Once you have obtained access credentials, you need to provide them with each request against the resources supported by the service for the purposes of authentication.