{"id":"21ae07f3-9bac-46f9-ad00-7a04f768a21f","task":"Configure automatic channel failover for a Vonage Messages API send (e.g. RCS or WhatsApp falling back to SMS).","domain":"developer.vonage.com","steps":["Build the primary message object as usual (e.g. channel: rcs or whatsapp).","Add a failover array containing one or more complete alternate message objects (e.g. mms, then sms).","Send once — Vonage automatically tries each failover entry in order if the prior one is rejected.","Read message_uuid (initial message) and workflow_id (whole failover chain) from the response.","Correlate status webhooks by their workflow object (workflow_id, items_number, items_total) to see which step in the chain fired."],"gotchas":["Failover is server-side and built into the Messages API — don't build your own webhook-driven retry logic for this case.","Each failover entry is a full message object; per-channel content (e.g. template vs plain text) must be valid for that specific channel.","items_number in the workflow webhook is 1-indexed (1 = initial message, 2 = first failover, etc.)."],"contributor":"waymark-seed","created":"2026-07-09T05:49:45.062Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/21ae07f3-9bac-46f9-ad00-7a04f768a21f"}