openapi: 3.0.3
info:
  title: Kno2 Communication Attachments Messaging API
  description: 'Kno2 is a healthcare Interoperability-as-a-Service network. Through a single Communication API you SEND, RECEIVE, and FIND patient information - Direct Secure Messaging, clinical document exchange, HL7 FHIR, HL7 V2.x, and cloud fax - across Kno2''s private network, Carequality, eHealth Exchange, and TEFCA (Kno2 is a federally designated QHIN).


    SCOPE AND SOURCING: The endpoints modeled in this document are the CONFIRMED messaging surface (api/token, api/messages, api/messages/{id}/attachments, api/documenttypes, api/directory/validate). They are grounded in Kno2''s own open-source integrator reference, the Kno2.ApiTestClient (https://github.com/Kno2/Kno2.ApiTestClient), whose configuration and helper code use these exact relative paths, HTTP verbs, and the OAuth2 client-credentials token flow. Request/response schemas are MODELED from that reference client and Kno2 product documentation; the full field-level contracts live behind the login-walled developer portal (https://developer.kno2.com) and are provisioned per partner.


    Kno2 also markets FHIR resource query/retrieval and cross-network patient record location (Carequality / eHealth Exchange / TEFCA). Those are real product capabilities but their specific endpoint paths are partner-provisioned and NOT publicly documented, so they are intentionally omitted here rather than fabricated.


    BASE HOST: Kno2 does not expose one shared public API host. Each integrator is provisioned a per-subscription tenant, e.g. https://{subscription}.kno2fy.com in production and https://{subscription}.kno2-stage.com in the staging sandbox. Access requires OAuth2 client credentials (client id + secret) and an IP allowlist configured by a Kno2 admin.'
  version: '1.0'
  contact:
    name: Kno2
    url: https://kno2.com
    email: info@kno2.com
  x-sourcing: Endpoints, paths, verbs, and the OAuth2 client-credentials token flow are CONFIRMED from Kno2's official ApiTestClient (github.com/Kno2/Kno2.ApiTestClient, app.config + ApiHelper.cs). Payload schemas are MODELED and simplified.
servers:
- url: https://{subscription}.kno2fy.com
  description: Production tenant (per-integrator subscription host)
  variables:
    subscription:
      default: your-subscription
      description: The subscription/tenant slug assigned to your Kno2 account.
- url: https://{subscription}.kno2-stage.com
  description: Staging sandbox tenant (Kno2 Developer Program)
  variables:
    subscription:
      default: your-subscription
      description: The staging subscription/tenant slug assigned to your account.
security:
- bearerAuth: []
tags:
- name: Messaging
  description: SEND surface - draft, populate, attach, and send messages.
paths:
  /api/messages:
    put:
      operationId: createMessageDraft
      tags:
      - Messaging
      summary: Request a new draft message
      description: Creates a new draft message and returns its identifier. CONFIRMED from ApiTestClient (RequestMessageDraft PUTs to api/messages).
      responses:
        '200':
          description: The created draft message.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /api/messages/{id}:
    parameters:
    - $ref: '#/components/parameters/MessageId'
    put:
      operationId: updateMessageDraft
      tags:
      - Messaging
      summary: Populate / update a draft message
      description: Updates a draft message with patient, recipient Direct address, document type, and metadata before sending. CONFIRMED from ApiTestClient (SendDraft PUTs the message resource to api/messages/{id}).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Message'
      responses:
        '200':
          description: The updated message.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /api/messages/{id}/send:
    parameters:
    - $ref: '#/components/parameters/MessageId'
    post:
      operationId: sendMessage
      tags:
      - Messaging
      summary: Send a message
      description: Releases/sends the populated draft over Direct Secure Messaging or document exchange. CONFIRMED from ApiTestClient (SendRelease POSTs to api/messages/{id}/send).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Message'
      responses:
        '200':
          description: The message was accepted for sending.
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Authentication failed or the token is missing/expired.
  schemas:
    Attachment:
      type: object
      description: MODELED - a clinical document attachment.
      properties:
        id:
          type: string
        fileName:
          type: string
        mediaType:
          type: string
          example: application/pdf
        documentType:
          type: string
        size:
          type: integer
    Patient:
      type: object
      description: MODELED - patient demographics attached to a message.
      properties:
        firstName:
          type: string
        lastName:
          type: string
        dateOfBirth:
          type: string
          format: date
        gender:
          type: string
        mrn:
          type: string
          description: Medical record number.
    Message:
      type: object
      description: MODELED - a Kno2 message resource. Field set simplified from the ApiTestClient MessageResource and product docs; the authoritative schema is provisioned per partner via developer.kno2.com.
      properties:
        id:
          type: string
        status:
          type: string
          example: draft
        subject:
          type: string
        patient:
          $ref: '#/components/schemas/Patient'
        recipients:
          type: array
          items:
            type: string
            description: Direct Secure Messaging address.
        documentType:
          type: string
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
        updatedDate:
          type: string
          format: date-time
  parameters:
    MessageId:
      name: id
      in: path
      required: true
      description: The message identifier.
      schema:
        type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer access token obtained from POST /api/token.
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic with base64(client_id:client_secret), used only against /api/token to obtain a Bearer token.