Specification v0.1. Layer 1 is the UmbrellaID KYB API as is; Layer 2 extends it (/kyb/poa…); Layer 3 extends the Poros API (/v1/kyb/sessions). Test Request runs against the demo environment demo-ikfz.api-umbrella.io: simulated responses from a fixed dataset, shapes are the contract (data for Automobilgruppe Harz-Leine GmbH, HRB 130032; any Bearer token, e.g. demo). Every example is pre-filled with valid demo ids, so any request works on its own; poa_demo and kyb_sess_demo always exist. Full sequence: search → details → poa → document → verify; or create a session, open its sessionUrl (a simulated hosted flow) and poll it.