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SendiMessage
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Developer guide

Receive iMessage via API

How inbound replies reach your application. When a customer answers, SendiMessage records the message, updates the conversation, and posts a signed webhook to your endpoint.

Inbound lifecycle

Customer sends a replySendiMessage line receives itMessage recordedConversation updatedreceive webhook posted to your app

Where replies show up

Inbound messages appear in GET /v2/messages with direction "in" and status RECEIVED, and in their conversation thread. The receive webhook notifies your endpoint the moment a reply arrives. Inbound STOP-family keywords set the sender's opt-out state automatically.

The event

receive webhook
{
  "id": "evt_01j6x6z9k3f8v9m2n4p5q6r7s8",
  "type": "receive",
  "created_at": "2026-08-21T09:07:35+00:00",
  "data": {
    "message": {
      "message_handle": "msg_01j6x6z6k3f8v9m2n4p5q6r7s8",
      "direction": "inbound",
      "from": "+14155550123",
      "to": "+15555550100",
      "text": "Can we move it to 3 PM?",
      "channel": "imessage",
      "status": "received",
      "line_handle": "line_01j6x6yak3f8v9m2n4p5q6r7s8"
    }
  }
}

Verify SendiMessage-Signature against the raw body before trusting the payload, then read data.message.text and data.message.from.

How are replies grouped?

By conversation — one thread per line and counterpart. You can page a thread's history over the API to reconstruct context for your app, CRM, or agent.

Verify and consume events

The webhook reference includes signature-verification examples in Node.js and Python.

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