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Qvalia's UBL-JSON keeps namespace prefixes (cac:AccountingSupplierParty, cbc:EndpointID) with attributes under `$` (verified live 2026-08-21 on the inbound test invoice Joanna sent to 0007:5595386219), not the unprefixed OASIS form the 409-recovery extractor assumed. Accept both. The probe gains `incoming [integrationId]` to list inbound statuses or print one inbound invoice as XML without marking it read. Refs #546 Claude-Session: https://claude.ai/code/session_01TqFpxeWqbpR7bcwUJLRERQ Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>