> ## Documentation Index
> Fetch the complete documentation index at: https://docs.classquill.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Message

> Send an in-app message into a conversation.

`sender_id` must be an accepted member of your org **and** an active participant
of the target conversation (404 otherwise) — the API can't impersonate a family
member or post into a thread it isn't part of. The message is sent as plain text,
visible to everyone in the thread, and the normal bell/email notifications fire.
Honours `Idempotency-Key`.



## OpenAPI

````yaml /openapi.json post /v1/messages
openapi: 3.1.0
info:
  title: EquateIt Public API
  description: >-
    REST API for EquateIt tutoring organisations. Pipe your sessions, invoices,
    payments, tutor earnings, students, and more into your own tools. Most
    endpoints are reads; a focused set of writes (each gated by a *:write scope)
    create or update data, including creating student/tutor/parent accounts.


    Authenticate every request with an org API key:

        Authorization: Token token=ei_live_...

    Mint keys in the EquateIt app under Settings → Developers.
  version: 1.0.0
servers: []
security:
  - ApiKeyAuth: []
tags:
  - name: General
  - name: Sessions
  - name: Tutors
  - name: Students & Parents
  - name: Billing
  - name: Curriculum
  - name: Coursework
  - name: Operations
  - name: Pricing
  - name: Bookings
  - name: Blog
  - name: Reports
paths:
  /v1/messages:
    post:
      tags:
        - General
      summary: Create Message
      description: >-
        Send an in-app message into a conversation.


        `sender_id` must be an accepted member of your org **and** an active
        participant

        of the target conversation (404 otherwise) — the API can't impersonate a
        family

        member or post into a thread it isn't part of. The message is sent as
        plain text,

        visible to everyone in the thread, and the normal bell/email
        notifications fire.

        Honours `Idempotency-Key`.
      operationId: create_message_v1_messages_post
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          schema:
            anyOf:
              - type: string
              - type: 'null'
            title: Idempotency-Key
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MessageCreate'
      responses:
        '201':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    MessageCreate:
      properties:
        conversation_id:
          type: string
          title: Conversation Id
        sender_id:
          type: string
          title: Sender Id
        content:
          type: string
          maxLength: 10000
          minLength: 1
          title: Content
        reply_to_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Reply To Id
      additionalProperties: false
      type: object
      required:
        - conversation_id
        - sender_id
        - content
      title: MessageCreate
      description: >-
        POST /v1/messages → send an in-app message into a conversation.
        `sender_id`

        must be an accepted org member who is an active participant of the
        conversation.

        The message is always inserted as `message_type='text'`,
        `visibility='everyone'`

        (so the existing notify/email/mirror triggers fire normally);
        system/private

        message types are not settable via the API.
    Message:
      properties:
        id:
          type: string
          title: Id
        conversation_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Conversation Id
        sender_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Sender Id
        content:
          anyOf:
            - type: string
            - type: 'null'
          title: Content
        message_type:
          anyOf:
            - type: string
            - type: 'null'
          title: Message Type
        visibility:
          anyOf:
            - type: string
            - type: 'null'
          title: Visibility
        reply_to_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Reply To Id
        created_at:
          anyOf:
            - type: string
            - type: 'null'
          title: Created At
      type: object
      required:
        - id
      title: Message
      description: >-
        One message in a thread. Only `visibility='everyone'` (non-deleted)
        messages

        are exposed by the read endpoints — family-private
        (`student_only`/`parent_only`)

        messages are never returned.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: Org API key as `Token token=ei_live_...`

````