Correlated message-ID lookup —
GET /api/v1/messages accepts
?message_ids=<id1,id2,...> (up to 100) as a cross-channel delivery log
search. Each id is OR-matched against the internal id OR the
provider-assigned external_id (e.g. a Twilio MessageSid, a WABA message
id, a Resend email id), so the provider id you already hold resolves the
same row. Combine with channel / from_date / to_date to narrow.string
Search DSL — fielded
field:value clauses AND-ed together. Supported fields include message_id, external_id, status, channel, direction, from, to, body, created, updated, conversation_id, contact_id. message_id and external_id both look up the provider-side identifier (Jasmin/SMPP receipt ref, Meta wamid, Resend email id, jambonz CallSid, Telnyx fax id) from the provider console. String fields support * wildcards. Invalid syntax or unknown fields return 400. See the Search message history guide.