# Create New Top-Level Message

Creates a new top-level message (thread) in the account identified by . Top-level messages are the starting point of a message thread (i.e.  == ), that is, not a response to any other message.

Endpoint: POST /message/send/{userId}
Version: 1.0
Security: sessionToken

## Path parameters:

  - `userId` (string, required)
    Tidepool User ID

## Request fields (application/json):

  - `message` (object)

  - `message.messagetext` (string, required)

  - `message.timestamp` (string, required)
    [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) / [ISO 8601](https://www.iso.org/iso-8601-date-and-time-format.html) timestamp _with_ timezone information
    Example: "2017-02-06T02:37:46Z"

  - `message.guid` (string, required)
    UUID v4 as defined in [RFC 4122](https://www.ietf.org/rfc/rfc4122.txt).
    Example: "b9468a76-4afc-4c33-8d1d-1f08324d9160"

## Response 201 fields (application/json):

  - `id` (string, required)
    Example: "60e64ddf98b2350011b0f37f"

## Response 401 fields (application/json):

  - `messages` (array)

## Response 403 fields (application/json):

  - `messages` (array)

## Response 404 fields (application/json):

  - `messages` (array)