curl -X POST https://console.trychert.com/api/v1/chats \
  -H "Authorization: Bearer $CHERT_SIGNING_SECRET" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "+15555550100",
    "to": ["+14155551234", "+14155559876"],
    "message": {
      "subject": "Launch follow-up",
      "parts": [
        { "type": "text", "value": "Starting this group here." }
      ],
      "idempotency_key": "group-launch-follow-up-001"
    }
  }'

const res = await fetch("https://console.trychert.com/api/v1/chats", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${CHERT_SIGNING_SECRET}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    from: "+15555550100",
    to: ["+14155551234", "+14155559876"],
    message: {
      subject: "Launch follow-up",
      parts: [{ type: "text", value: "Starting this group here." }],
      idempotency_key: "group-launch-follow-up-001",
    },
  }),
})

{
  "chat": {
    "id": "0f2d3c1a-8b4e-4f6a-90d2-1a3b4c5d6e7f",
    "display_name": "Launch follow-up",
    "handles": [
      { "service": "imessage", "address": "+14155551234" },
      { "service": "imessage", "address": "+14155559876" }
    ],
    "is_group": true,
    "service": "imessage",
    "health_score": 87,
    "created_at": "2026-05-01T12:00:00Z"
  },
  "message": {
    "id": "46eb1003c8b54b7ea8f1c2b03e9a7d12",
    "chat_id": "0f2d3c1a-8b4e-4f6a-90d2-1a3b4c5d6e7f",
    "parts": [{ "type": "text", "value": "Starting this group here." }],
    "status": "sent",
    "direction": "outbound",
    "created_at": "2026-05-01T12:00:00Z",
    "delivered_at": null,
    "read_at": null,
    "service": "imessage"
  }
}