> ## 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. # Update Session > Update a SCHEDULED session (reschedule/edit). 404 if it isn't in your org; 422 if it isn't `scheduled`. A time change that collides with the tutor's other scheduled session returns 409. Honours `Idempotency-Key`. ## OpenAPI ````yaml /openapi.json put /v1/sessions/{session_id} openapi: 3.1.0 info: title: ClassQuill Public API description: >- REST API for ClassQuill 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 ClassQuill 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/sessions/{session_id}: put: tags: - Sessions summary: Update Session description: >- Update a SCHEDULED session (reschedule/edit). 404 if it isn't in your org; 422 if it isn't `scheduled`. A time change that collides with the tutor's other scheduled session returns 409. Honours `Idempotency-Key`. operationId: update_session_v1_sessions__session_id__put parameters: - name: session_id in: path required: true schema: type: string title: Session Id - 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/SessionUpdate' responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/Session' '401': description: Missing, malformed, revoked, or expired credentials. content: application/json: schema: $ref: '#/components/schemas/ApiError' '403': description: The credential lacks the scope this endpoint requires. content: application/json: schema: $ref: '#/components/schemas/ApiError' '404': description: >- Not found — the record doesn't exist or belongs to another organisation. content: application/json: schema: $ref: '#/components/schemas/ApiError' '422': description: Validation error — `error.details.errors` lists the fields. content: application/json: schema: $ref: '#/components/schemas/ApiError' '429': description: >- Rate limit exceeded — honour Retry-After and the RateLimit-* headers. content: application/json: schema: $ref: '#/components/schemas/ApiError' components: schemas: SessionUpdate: properties: starts_at: anyOf: - type: string - type: 'null' title: Starts At ends_at: anyOf: - type: string - type: 'null' title: Ends At duration_minutes: anyOf: - type: integer - type: 'null' title: Duration Minutes title: anyOf: - type: string - type: 'null' title: Title mode: anyOf: - type: string - type: 'null' title: Mode additionalProperties: false type: object title: SessionUpdate description: >- PUT /v1/sessions/{session_id} — reschedule/edit a SCHEDULED session. Partial update; only these fields are writable via the API. Session: properties: id: type: string title: Id status: anyOf: - type: string - type: 'null' title: Status title: anyOf: - type: string - type: 'null' title: Title tutor_id: anyOf: - type: string - type: 'null' title: Tutor Id student_id: anyOf: - type: string - type: 'null' title: Student Id starts_at: anyOf: - type: string - type: 'null' title: Starts At ends_at: anyOf: - type: string - type: 'null' title: Ends At duration_minutes: anyOf: - type: integer - type: 'null' title: Duration Minutes tutor_pay_rate_cents: anyOf: - type: integer - type: 'null' title: Tutor Pay Rate Cents student_rate_cents: anyOf: - type: integer - type: 'null' title: Student Rate Cents amount_owed_cents: anyOf: - type: integer - type: 'null' title: Amount Owed Cents mode: anyOf: - type: string - type: 'null' title: Mode subject_id: anyOf: - type: string - type: 'null' title: Subject Id created_at: anyOf: - type: string - type: 'null' title: Created At completed_at: anyOf: - type: string - type: 'null' title: Completed At type: object required: - id title: Session ApiError: description: Canonical error envelope for every /v1 error response (4xx/5xx). properties: error: $ref: '#/components/schemas/ApiErrorBody' required: - error title: ApiError type: object ApiErrorBody: description: The `error` object every /v1 error response carries. properties: code: description: >- Stable machine-readable error code: bad_request, unauthorized, forbidden, not_found, conflict, validation_error, rate_limited, or internal_error. examples: - not_found title: Code type: string message: description: Human-readable explanation, safe to surface to end users. examples: - Session not found title: Message type: string status: description: The HTTP status code, repeated in the body. examples: - 404 title: Status type: integer details: additionalProperties: true description: >- Error-specific context. 422 carries the field errors under `errors`; 429 carries `retry_after_seconds`. title: Details type: object required: - code - message - status title: ApiErrorBody type: object securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization description: Org API key as `Token token=ei_live_...` ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.