The registration process is a "demo" and has no relation\link to the TPPs Open Banking user credentials.
Our ASPSP details:
ForgeRock Financial ID: 0015800001041REAAY
As a developer, you would like:
Forgerock Sample codes: https://github.com/ForgeRock/ForgeRock-OpenBanking-Sample
ForgeRock Open Banking Datamodel SDK: https://github.com/ForgeRock/OpenBanking-Java-SDK