KYC / KYB symptoms (partner)

Symptom	Treat as	Caller action
HTTP 200 + clear no-match	Completed negative	Show no-match to ops; do not retry as if transport failed
HTTP 200 + sparse/ambiguous vendor fields	Uncertain	Do not coerce to pass/fail without policy
Timeout / 5xx	Could not finish	Backoff; avoid duplicate expensive calls; see error matrix
Gateway auth failure	Could not run	Fix environment credentials
Sustained vendor failures	Provider issue	Escalate with triage; follow your outage policy

Distinguish outcomes carefully — KYC product limitations.