In docker-compose.yml (under SYSTEM_PROPERTIES) configure the following values. This has to be done for Identity Manager Admin (for selecting layouts and map input fields) and for Identity Manager Operator (for ordering cards).
caasCommunicationService.clientId=ADD_CLIENT_ID_HERE
caasCommunicationService.clientSecret=ADD_CLIENT_SECRET_HERE
caasCommunicationService.organisationId=ADD_ORGANISATION_ID_HERE
caasCommunicationService.hostname": "${IDM_CAAS_HOSTNAME}
You must add proper values for clientId, clientSecret and organisationId in order to be able to authenticate and send requests to the Nexus GO API. hostname is optional, but if used, it shall have the value "cards.nxsas.com"