The BFF is the portals' only backend (§8.3): it validates Keycloak digid-realm
JWTs on POST /self-service/registrations (extracting bsn → domain), leaves
GET /openbaar/register anonymous (public lookup, S-09), and fans out to the
domain and projection over typed HTTP clients. Tests mint tokens with a test
signing key; real Keycloak validation is a live-stack verify-bff check. Records
the container OIDC issuer-mismatch wrinkle. OpenAPI is generated + committed for
the S-08 client.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
