openapi: 3.2.0
info:
  title: Canvas Medical FHIR Medication Request API
  description: A FHIR R4-compliant REST API providing secure access to electronic health record data. Canvas Medical supports 41 FHIR resources (21 with write capabilities) covering clinical, administrative, financial, and care coordination domains. The API follows the HL7 FHIR R4 specification and supports OAuth 2.0 Client Credentials and Authorization Code flows with SMART on FHIR scopes for machine-to-machine and user-delegated access.
  version: '4.0'
  contact:
    name: Canvas Medical Support
    url: https://help.canvasmedical.com/
  termsOfService: https://www.canvasmedical.com/
  license:
    name: HL7 FHIR R4
    url: https://hl7.org/fhir/R4/
servers:
- url: https://fumage-{canvas-instance}.canvasmedical.com
  description: FHIR R4 base URL (fumage subdomain)
  variables:
    canvas-instance:
      default: yoursandbox
      description: Your Canvas Medical instance name
security:
- OAuth2ClientCredentials: []
- OAuth2AuthCode: []
- BearerAuth: []
tags:
- name: Medication Request
  description: Medication prescriptions and orders
paths:
  /MedicationRequest:
    get:
      operationId: searchMedicationRequest
      summary: Search MedicationRequests
      description: Search for medication prescriptions and orders
      tags:
      - Medication Request
      parameters:
      - $ref: '#/components/parameters/patient'
      - $ref: '#/components/parameters/status'
      - name: intent
        in: query
        schema:
          type: string
      - $ref: '#/components/parameters/count'
      - $ref: '#/components/parameters/pageToken'
      responses:
        '200':
          description: Bundle of matching medication requests
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/Bundle'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createMedicationRequest
      summary: Create MedicationRequest
      tags:
      - Medication Request
      requestBody:
        required: true
        content:
          application/fhir+json:
            schema:
              $ref: '#/components/schemas/MedicationRequest'
      responses:
        '201':
          description: MedicationRequest created
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/MedicationRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /MedicationRequest/{id}:
    get:
      operationId: readMedicationRequest
      summary: Read MedicationRequest
      tags:
      - Medication Request
      parameters:
      - $ref: '#/components/parameters/resourceId'
      responses:
        '200':
          description: MedicationRequest resource
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/MedicationRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/ResourceNotFound'
    put:
      operationId: updateMedicationRequest
      summary: Update MedicationRequest
      tags:
      - Medication Request
      parameters:
      - $ref: '#/components/parameters/resourceId'
      requestBody:
        required: true
        content:
          application/fhir+json:
            schema:
              $ref: '#/components/schemas/MedicationRequest'
      responses:
        '200':
          description: MedicationRequest updated
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/MedicationRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/ResourceNotFound'
components:
  schemas:
    Coding:
      type: object
      properties:
        system:
          type: string
        version:
          type: string
        code:
          type: string
        display:
          type: string
        userSelected:
          type: boolean
    Meta:
      type: object
      properties:
        versionId:
          type: string
        lastUpdated:
          type: string
          format: date-time
        source:
          type: string
        profile:
          type: array
          items:
            type: string
        tag:
          type: array
          items:
            $ref: '#/components/schemas/Coding'
    MedicationRequest:
      allOf:
      - $ref: '#/components/schemas/FHIRResource'
      - type: object
        required:
        - resourceType
        - status
        - intent
        - subject
        properties:
          resourceType:
            type: string
            default: MedicationRequest
          status:
            type: string
            enum:
            - active
            - on-hold
            - cancelled
            - completed
            - entered-in-error
            - stopped
            - draft
            - unknown
          intent:
            type: string
            enum:
            - proposal
            - plan
            - order
            - original-order
            - reflex-order
            - filler-order
            - instance-order
            - option
          medicationCodeableConcept:
            $ref: '#/components/schemas/CodeableConcept'
          medicationReference:
            $ref: '#/components/schemas/Reference'
          subject:
            $ref: '#/components/schemas/Reference'
          encounter:
            $ref: '#/components/schemas/Reference'
          authoredOn:
            type: string
            format: date-time
          requester:
            $ref: '#/components/schemas/Reference'
    OperationOutcome:
      type: object
      properties:
        resourceType:
          type: string
          default: OperationOutcome
        issue:
          type: array
          items:
            type: object
            properties:
              severity:
                type: string
                enum:
                - fatal
                - error
                - warning
                - information
              code:
                type: string
              details:
                $ref: '#/components/schemas/CodeableConcept'
              diagnostics:
                type: string
              location:
                type: array
                items:
                  type: string
    Narrative:
      type: object
      properties:
        status:
          type: string
          enum:
          - generated
          - extensions
          - additional
          - empty
        div:
          type: string
    CodeableConcept:
      type: object
      properties:
        coding:
          type: array
          items:
            $ref: '#/components/schemas/Coding'
        text:
          type: string
    Reference:
      type: object
      properties:
        reference:
          type: string
        type:
          type: string
        display:
          type: string
    FHIRResource:
      type: object
      description: Base FHIR R4 resource properties
      properties:
        resourceType:
          type: string
          description: FHIR resource type name
        id:
          type: string
          description: Logical id of this artifact
        meta:
          $ref: '#/components/schemas/Meta'
        text:
          $ref: '#/components/schemas/Narrative'
    Bundle:
      type: object
      properties:
        resourceType:
          type: string
          default: Bundle
        id:
          type: string
        type:
          type: string
          enum:
          - document
          - message
          - transaction
          - transaction-response
          - batch
          - batch-response
          - history
          - searchset
          - collection
          - subscription-notification
        total:
          type: integer
        link:
          type: array
          items:
            type: object
            properties:
              relation:
                type: string
              url:
                type: string
        entry:
          type: array
          items:
            type: object
            properties:
              fullUrl:
                type: string
              resource:
                $ref: '#/components/schemas/FHIRResource'
              search:
                type: object
                properties:
                  mode:
                    type: string
                    enum:
                    - match
                    - include
                    - outcome
  parameters:
    count:
      name: _count
      in: query
      schema:
        type: integer
        default: 20
      description: Maximum number of results per page
    status:
      name: status
      in: query
      schema:
        type: string
      description: Filter by resource status
    resourceId:
      name: id
      in: path
      required: true
      schema:
        type: string
      description: Logical ID of the FHIR resource
    pageToken:
      name: _page_token
      in: query
      schema:
        type: string
      description: Pagination token for next page
    patient:
      name: patient
      in: query
      schema:
        type: string
      description: Filter by patient ID or reference
  responses:
    ResourceNotFound:
      description: Resource not found
      content:
        application/fhir+json:
          schema:
            $ref: '#/components/schemas/OperationOutcome'
    UnprocessableEntity:
      description: Validation error
      content:
        application/fhir+json:
          schema:
            $ref: '#/components/schemas/OperationOutcome'
    Unauthorized:
      description: Authentication required
      content:
        application/fhir+json:
          schema:
            $ref: '#/components/schemas/OperationOutcome'
  securitySchemes:
    OAuth2ClientCredentials:
      type: oauth2
      description: 'Machine-to-machine authentication using client credentials grant. Obtain client_id and client_secret from Canvas admin panel.

        '
      flows:
        clientCredentials:
          tokenUrl: https://{canvas-instance}.canvasmedical.com/auth/token/
          scopes:
            system/*.read: Read all FHIR resources
            system/*.write: Write all FHIR resources
            system/Patient.read: Read Patient resources
            system/Patient.write: Write Patient resources
            system/Appointment.read: Read Appointment resources
            system/Appointment.write: Write Appointment resources
            system/Observation.read: Read Observation resources
            system/Observation.write: Write Observation resources
    OAuth2AuthCode:
      type: oauth2
      description: 'User-delegated access using Authorization Code flow with SMART on FHIR scopes.

        '
      flows:
        authorizationCode:
          authorizationUrl: https://{canvas-instance}.canvasmedical.com/auth/authorize/
          tokenUrl: https://{canvas-instance}.canvasmedical.com/auth/token/
          scopes:
            patient/*.read: Read patient-context FHIR resources
            user/*.read: Read user-context FHIR resources
            user/*.write: Write user-context FHIR resources
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
externalDocs:
  description: Canvas Medical FHIR API Documentation
  url: https://docs.canvasmedical.com/api/