Failed-message breakdown by error code
Returns the leading provider/carrier error codes behind failed messages over the selected date range, each with its occurrence count, alongside the total failed volume — the drill-down operators use to see which rejection reason dominates. Optionally filter to a single channel. Read-only; degrades to an empty breakdown (still 200) during a transient database blip instead of a blind 5xx.
Authorizations
Dashboard JWT token from Clerk
Query Parameters
Inclusive start of the reporting window (ISO-8601 date, e.g. 2026-07-01). Defaults to the tenant's standard lookback when omitted; the range may not exceed the platform lookback cap.
Inclusive end of the reporting window (ISO-8601 date). A single-day range (start_date === end_date) is accepted.
Alternative rolling lookback in whole days (bounded by the lookback cap). Mutually exclusive with an explicit start/end range.
x >= 1Optional single-channel filter (e.g. sms, whatsapp, email).