Create thread message

Creates a message inside one thread. This supports both inbound adapter traffic and outbound replies.

POST/api/v1/experimental/channels/{channelId}/threads/{threadId}/messages

Creates a message inside one thread. This supports both inbound adapter traffic and outbound replies.

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

threadId?string

parentMessageId?|

externalId?|

direction*string

Whether the message was received, sent, or generated internally.

Value in"inbound" | "outbound" | "internal" | "system"

status?string

Delivery or ingestion status for the message.

Value in"pending" | "received" | "sent" | "delivered" | "failed"

kind?string

Normalized message category.

Value in"text" | "event" | "call" | "system"

text?|

raw?unknown

author*

Normalized actor information associated with a message.

Example

{
  "role": "user",
  "name": "Jane Customer",
  "email": "jane@example.com",
  "externalId": "wa:+15551234567"
}

metadata?|

attachments?array<>

Response Body

`application/json`

curl -X POST "https://loading/api/v1/experimental/channels/{channelId}/threads/{threadId}/messages" \  -H "Content-Type: application/json" \  -d '{    "threadId": "4c2bff3c-a694-4b4e-8da4-6030f534266f",    "externalId": "wamid.HBgLN...",    "direction": "inbound",    "status": "received",    "kind": "text",    "text": "Need help with my order",    "raw": {      "provider": "whatsapp"    },    "author": {      "role": "user",      "name": "Jane Customer",      "email": "jane@example.com",      "externalId": "wa:+15551234567"    },    "metadata": {      "source": "webhook"    },    "attachments": [      {        "name": "invoice.pdf",        "contentType": "application/pdf",        "url": "https://example.com/invoice.pdf",        "sizeBytes": 102400      }    ]  }'

{
  "id": "5a354f89-0b1f-40d1-80d3-32c3a901c8e3",
  "channelId": "6e0d4e3f-b4fd-4dc1-bddf-cd86d708bdcb",
  "threadId": "4c2bff3c-a694-4b4e-8da4-6030f534266f",
  "parentMessageId": null,
  "externalId": "wamid.HBgLN...",
  "direction": "inbound",
  "status": "received",
  "kind": "text",
  "text": "Need help with my order",
  "raw": {
    "provider": "whatsapp"
  },
  "author": {
    "role": "user",
    "name": "Jane Customer",
    "email": "jane@example.com",
    "externalId": "wa:+15551234567"
  },
  "metadata": {
    "source": "webhook"
  },
  "attachments": [
    {
      "name": "invoice.pdf",
      "contentType": "application/pdf",
      "url": "https://example.com/invoice.pdf",
      "sizeBytes": 102400
    }
  ],
  "createdAt": "2026-03-09T13:00:00.000Z",
  "updatedAt": "2026-03-09T13:00:00.000Z"
}

{
  "issues": [
    {
      "_tag": "Pointer",
      "path": [
        "string"
      ],
      "message": "string"
    }
  ],
  "message": "string",
  "_tag": "HttpApiDecodeError"
}

{
  "code": "authentication_required",
  "message": "Authentication required. Send Authorization: Bearer <api-key>, x-api-key, or a signed-in session."
}

{
  "code": "insufficient_permissions",
  "message": "This API key does not have the required permission.",
  "details": {
    "requiredPermission": "resource.action"
  }
}

{
  "code": "not_found",
  "message": "The requested resource was not found."
}

{
  "code": "internal_error",
  "message": "An unexpected server error occurred."
}

Create thread message

Request Body

Response Body

201application/json

400application/json

401application/json

403application/json

404application/json

500application/json

`application/json`

`application/json`

`application/json`

`application/json`

`application/json`

`application/json`