> ## Documentation Index > Fetch the complete documentation index at: https://docs.orbit.devotel.io/llms.txt > Use this file to discover all available pages before exploring further. # Get a profile's trait change history > Returns the append-only ledger of trait value transitions for the contact identified by your user_id (external_id), newest first — the audit timeline that answers "when did `lifetime_orders` flip from 3 to 8 and what triggered it?". Filter to one trait with `?trait_name=`, page with the composite `?cursor=` from each response's next_cursor (preferred) or the legacy `?before=` ISO timestamp. Requires owner/admin/developer + contacts:read. ## OpenAPI ````yaml /openapi.yaml get /api/v1/cdp/profiles/by-user-id/{user_id}/trait-history openapi: 3.1.0 info: title: Devotel CPaaS API description: Orbit by Devotel — Communications Platform as a Service API version: 1.0.0 contact: name: Devotel url: https://devotel.io email: support@devotel.io license: name: Proprietary servers: - url: https://api.orbit.devotel.io description: Production security: - Bearer: [] - ApiKey: [] tags: - name: Messages description: >- Send and manage messages across all channels (SMS, WhatsApp, RCS, Email, Viber, etc.) - name: Agents description: AI agent creation, configuration, and execution - name: Voice description: Voice calls, IVR, conferencing, and SIP trunking - name: Webhooks description: Webhook endpoint management and delivery logs - name: Numbers description: Phone number search, provisioning, and configuration - name: Contacts description: Contact management, segmentation, and lifecycle tracking - name: Campaigns description: Marketing campaign orchestration and analytics - name: Flows description: Automation flow builder and execution engine - name: Templates description: Message template management and approval workflows - name: Settings description: Organization, channel, and user preference settings - name: Verify description: OTP generation and verification across channels - name: Push description: Push notification delivery via FCM and APNs - name: Telegram description: >- Telegram bring-your-own-bot channel: connect a bot, verify a chat against the shared sandbox bot, and read unified channel state. Production sends go through the Messaging API. - name: USSD description: >- Menu-driven USSD for feature phones: define a menu tree, simulate session steps, and host the tenant-scoped aggregator callback. - name: Integrations description: Third-party service connections and OAuth management - name: Files description: >- Server-to-server media upload, listing, retrieval, and deletion (signed-URL backed) - name: Messaging Services description: >- Twilio MessagingService-parity containers bundling sender pool, opt-out list, inbound webhook, and sticky-sender/geomatch flags - name: Sender Pools description: >- Group sending numbers into pools with a selection strategy (sticky / round-robin / random) for outbound sends - name: Opt-Out Lists description: >- Per-list STOP / HELP / START keyword sets and auto-response copy (Twilio Advanced Opt-Out parity) - name: SMPP description: Tenant BYO-SMPP bind credentials and upstream termination carriers - name: Commerce description: >- Unified omnichannel conversational-commerce: cart/checkout state machine, cross-channel payment reconciliation, hosted pay-by-link, native WhatsApp checkout, and agentic-checkout payment mandates - name: Orby description: >- In-dashboard Orby operator assistant: streamed assistant turns, conversation threads, product knowledge-base search, and the tool-action approval gate. Available to signed-in operators only (dashboard session auth — API-key requests are rejected). paths: /api/v1/cdp/profiles/by-user-id/{user_id}/trait-history: get: tags: - CDP summary: Get a profile's trait change history description: >- Returns the append-only ledger of trait value transitions for the contact identified by your user_id (external_id), newest first — the audit timeline that answers "when did `lifetime_orders` flip from 3 to 8 and what triggered it?". Filter to one trait with `?trait_name=`, page with the composite `?cursor=` from each response's next_cursor (preferred) or the legacy `?before=` ISO timestamp. Requires owner/admin/developer + contacts:read. parameters: - schema: type: string in: query name: trait_name required: false description: Restrict the timeline to a single trait (e.g. `lifetime_orders`). - schema: type: string in: query name: limit required: false description: >- Page size (1-200, default 50). Out-of-range or non-numeric values degrade to the default. - schema: type: string in: query name: before required: false description: >- Legacy single-column cursor: rows changed before this ISO8601 timestamp. Prefer the composite `cursor`. - schema: type: string in: query name: cursor required: false description: >- Opaque composite (changed_at, id) pagination cursor — pass the previous response's next_cursor verbatim. Stable across identical timestamps. - schema: type: string in: path name: user_id required: true responses: '200': description: One page of trait transitions, newest first, with next-page cursors. content: application/json: schema: description: >- One page of trait transitions, newest first, with next-page cursors. type: object additionalProperties: true example: data: user_id: ext_44882 contact_id: cnt_01J8XF3T4W5Q6N7V8R9M0K1P data: - id: ctr_01J8ZA1B2C3D4E5F6G7H8J9K trait_name: lifetime_orders trait_kind: computed old_value: 3 new_value: 8 source: trait-recompute-worker triggered_by_event_id: evt_01J8ZC4D5E6F7G8H9J0K1L2M changed_at: '2026-08-18T21:14:00.000Z' - id: ctr_01J8YB9C8D7E6F5G4H3J2K1L trait_name: lifecycle_stage trait_kind: standard old_value: lead new_value: customer source: cdp.identify triggered_by_event_id: null changed_at: '2026-08-12T09:02:00.000Z' count: 2 next_before: '2026-08-12T09:02:00.000Z' next_cursor: >- eyJjaGFuZ2VkX2F0IjoiMjAyNi0wOC0xMlQwOTowMjowMC4wMDBaIiwiaWQiOiJjdHJfMDFKOFlCOUM4RDdFNkY1RzRIM0oySzFMIn0 meta: request_id: req_01J8Z9K3P4Q5R6S7T8U9V0W1X2 timestamp: '2026-08-19T12:00:00.000Z' '400': $ref: '#/components/responses/StandardError' '404': $ref: '#/components/responses/StandardError' '422': $ref: '#/components/responses/StandardError' '429': $ref: '#/components/responses/RateLimitedResponse' '500': $ref: '#/components/responses/StandardError' security: [] components: responses: StandardError: description: >- Standard error envelope. `error.code` is machine-readable; see the [error reference](https://docs.orbit.devotel.io/reference/error-codes) for the catalogue. content: application/json: schema: type: object properties: error: type: object required: - code - message - status properties: code: type: string description: Machine-readable error code (e.g. INVALID_PHONE_NUMBER) message: type: string description: Human-readable error description status: type: integer description: HTTP status code details: type: object additionalProperties: true description: Additional context about the error meta: type: object properties: request_id: type: string timestamp: type: string format: date-time docs_url: type: string format: uri description: Link to relevant error documentation RateLimitedResponse: description: >- Rate limit exceeded. Wait `error.retry_after` seconds (or read the `Retry-After` header) before retrying. Returned when the request would exceed the bucket identified by `X-RateLimit-Bucket`. headers: X-RateLimit-Limit: description: Total request quota for the current window. schema: type: integer minimum: 0 X-RateLimit-Remaining: description: Requests remaining in the current window. schema: type: integer minimum: 0 X-RateLimit-Reset: description: >- Absolute unix-epoch-seconds timestamp at which the current window resets. schema: type: integer minimum: 0 X-RateLimit-Bucket: description: >- Name of the rate-limit bucket the request was bound by (e.g. `auth-write`, `money`, `agent-invoke`, or `custom:/`). Stripe-style — lets clients see which named cap they hit. schema: type: string RateLimit-Limit: description: >- draft-ietf-httpapi-ratelimit-headers no-prefix mirror of `X-RateLimit-Limit`. Some SDKs read only this form. schema: type: integer minimum: 0 RateLimit-Remaining: description: >- draft-ietf-httpapi-ratelimit-headers no-prefix mirror of `X-RateLimit-Remaining`. schema: type: integer minimum: 0 RateLimit-Reset: description: >- draft-ietf-httpapi-ratelimit-headers no-prefix mirror — delta seconds from now until the window resets (NOT epoch). schema: type: integer minimum: 0 Retry-After: description: >- RFC 7231 §7.1.3 — number of seconds the client should wait before retrying. schema: type: integer minimum: 1 content: application/json: schema: type: object properties: error: type: object required: - code - message - status - retry_after properties: code: type: string enum: - RATE_LIMITED description: >- Always `RATE_LIMITED` — the global request-limiter 429. Distinct from `RATE_LIMIT_EXCEEDED`, the live per-recipient/per-tenant/per-resource frequency-cap 429 (not retired). message: type: string status: type: integer enum: - 429 retry_after: type: integer minimum: 1 description: >- Seconds to wait before retrying. Mirrors `Retry-After` header. meta: type: object properties: request_id: type: string timestamp: type: string format: date-time docs_url: type: string format: uri securitySchemes: Bearer: type: http scheme: bearer bearerFormat: JWT description: Dashboard JWT token from Clerk ApiKey: type: apiKey name: X-API-Key in: header description: Server-to-server API key (dv_live_sk_*) ````