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

# Read change feed

> Read created, updated and deleted normalized-resource changes in ascending sequence order. A cursor from a synchronization checkpoint is required on the first request; thereafter use the returned resume_cursor. Never reuse a collection cursor. Persist the returned resume_cursor only after durably applying every event in the page, deduplicating by resource type, ID and version. A terminal or empty page still returns a resume_cursor; poll it later to receive new changes. Each successful poll returns cursor_expires_at. A cursor expired beyond that time returns 410 cursor_expired and requires a new checkpoint plus a fresh bootstrap. Filters and workspace binding cannot change mid-stream. Deleted resources emit tombstones. Billing resources use billing snapshots and billing events, not this normalized-data feed.

**Required scope:** `platform:read`

Read created, updated and deleted normalized-resource changes in ascending sequence order. A cursor from a synchronization checkpoint is required on the first request; thereafter use the returned resume\_cursor. Never reuse a collection cursor. Persist the returned resume\_cursor only after durably applying every event in the page, deduplicating by resource type, ID and version. A terminal or empty page still returns a resume\_cursor; poll it later to receive new changes. Each successful poll returns cursor\_expires\_at. A cursor expired beyond that time returns 410 cursor\_expired and requires a new checkpoint plus a fresh bootstrap. Filters and workspace binding cannot change mid-stream. Deleted resources emit tombstones. Billing resources use billing snapshots and billing events, not this normalized-data feed.

[Product scope](https://docs.amlok.io/api-reference/products-and-endpoints.md) · [Processing lifecycle](https://docs.amlok.io/api-reference/processing-lifecycle.md) · [Errors](https://docs.amlok.io/api-reference/errors.md)


## OpenAPI

````yaml openapi/amlok-v1.json GET /v1/changes
openapi: 3.1.0
info:
  title: AMLOK API
  version: 1.4.2
  description: >-
    API reference for AMLOK 1.4.2, with example requests and responses.
    Configure your institution-issued environment URL before making requests.
  x-source-workbook: >-
    https://docs.google.com/spreadsheets/d/14pU2PLv9JDda8gAa1367hipa2oJQB260fIJthevrp10/edit
servers:
  - url: https://api.example.com
    description: Set the server URL to your institution-issued AMLOK environment URL.
security:
  - BearerAuth: []
tags:
  - name: Platform
    description: Platform operations.
  - name: Identity
    description: Identity operations.
  - name: Banking
    description: Banking operations.
  - name: Payments
    description: Payments operations.
  - name: Commerce
    description: Commerce operations.
  - name: Accounting
    description: Accounting operations.
  - name: Inventory
    description: Inventory operations.
  - name: Lending
    description: Lending operations.
  - name: Liens
    description: Liens operations.
  - name: Risk
    description: Risk operations.
  - name: Operations
    description: Operations operations.
  - name: Webhooks
    description: Webhooks operations.
  - name: Reporting
    description: Reporting operations.
paths:
  /v1/changes:
    get:
      tags:
        - Platform
      summary: Read change feed
      description: >-
        Read created, updated and deleted normalized-resource changes in
        ascending sequence order. A cursor from a synchronization checkpoint is
        required on the first request; thereafter use the returned
        resume_cursor. Never reuse a collection cursor. Persist the returned
        resume_cursor only after durably applying every event in the page,
        deduplicating by resource type, ID and version. A terminal or empty page
        still returns a resume_cursor; poll it later to receive new changes.
        Each successful poll returns cursor_expires_at. A cursor expired beyond
        that time returns 410 cursor_expired and requires a new checkpoint plus
        a fresh bootstrap. Filters and workspace binding cannot change
        mid-stream. Deleted resources emit tombstones. Billing resources use
        billing snapshots and billing events, not this normalized-data feed.
      operationId: EP164
      parameters:
        - name: X-Request-ID
          in: header
          required: false
          description: >-
            Optional caller correlation ID; the response includes AMLOK
            request_id.
          schema:
            type: string
          example: client-request-example
        - name: limit
          in: query
          required: false
          description: Page size. Default 100, maximum 200.
          schema:
            type: integer
            minimum: 1
            maximum: 200
            default: 100
          example: 100
        - name: cursor
          in: query
          required: true
          description: Opaque AMLOK cursor. Preserve the original filters.
          schema:
            type: string
          example: changes_after_checkpoint_example
        - name: resource_types
          in: query
          required: false
          description: >-
            Optional comma-separated types. When omitted, inherit the checkpoint
            types; if supplied, must match them exactly.
          schema:
            type: string
          example: bank_transaction,lien
      responses:
        '200':
          description: Read authorized normalized resource changes.
          headers:
            X-Request-ID:
              description: AMLOK response correlation identifier.
              schema:
                type: string
              example: req_example
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChangePage'
              examples:
                synthetic:
                  summary: Synthetic read change feed
                  value:
                    data:
                      - resource_type: bank_transaction
                        resource_id: btx_example
                        resource_version: 2
                        action: updated
                        changed_at: '2026-10-23T14:00:00Z'
                        sequence: 42
                    page:
                      next_cursor: null
                      has_more: false
                      limit: 100
                    meta:
                      request_id: req_example
                      schema_version: 1.4.2
                      generated_at: '2026-10-23T14:00:00Z'
                      data_status: complete
                    resume_cursor: changes_after_sequence_42
                    cursor_expires_at: '2026-11-01T14:00:00Z'
        '400':
          $ref: '#/components/responses/Error400'
        '401':
          $ref: '#/components/responses/Error401'
        '403':
          $ref: '#/components/responses/Error403'
        '404':
          $ref: '#/components/responses/Error404'
        '410':
          $ref: '#/components/responses/Error410'
        '429':
          $ref: '#/components/responses/Error429'
        '500':
          $ref: '#/components/responses/Error500'
        '502':
          $ref: '#/components/responses/Error502'
        '503':
          $ref: '#/components/responses/Error503'
      security:
        - BearerAuth: []
      x-codeSamples:
        - lang: Shell
          label: cURL
          source: |-
            curl --request GET --fail-with-body --max-time 30 \
              "${AMLOK_API_BASE_URL}/v1/changes?limit=100&cursor=changes_after_checkpoint_example&resource_types=bank_transaction%2Clien" \
              --header "Authorization: Bearer ${AMLOK_API_KEY}" \
              --header "Accept: application/json"
        - lang: Python
          source: |-
            import os
            import requests

            base_url = os.environ["AMLOK_API_BASE_URL"].rstrip("/")
            headers = {'Accept': 'application/json'}
            headers["Authorization"] = "Bearer " + os.environ["AMLOK_API_KEY"]

            response = requests.request(
                "GET", base_url + "/v1/changes?limit=100&cursor=changes_after_checkpoint_example&resource_types=bank_transaction%2Clien",
                headers=headers, timeout=30, allow_redirects=False,
            )
            response.raise_for_status()
            print(response.json())
        - lang: JavaScript
          label: Node.js
          source: >-

            const baseUrl = process.env.AMLOK_API_BASE_URL;

            const apiKey = process.env.AMLOK_API_KEY;

            if (!baseUrl || !apiKey) throw new Error("Configure
            AMLOK_API_BASE_URL and AMLOK_API_KEY");

            const headers = {
              "Accept": "application/json"
            };

            headers.Authorization = `Bearer ${apiKey}`;

            const response = await fetch(baseUrl.replace(/\/$/, "") +
            "/v1/changes?limit=100&cursor=changes_after_checkpoint_example&resource_types=bank_transaction%2Clien",
            {
              method: "GET", headers,
              redirect: "error", signal: AbortSignal.timeout(30000),
            });

            if (!response.ok) throw new Error(`AMLOK returned HTTP
            ${response.status}`);

            console.log(await response.json());
components:
  schemas:
    ChangePage:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/Change'
          description: Ordered authorized normalized changes.
        page:
          $ref: '#/components/schemas/Page'
          description: Tenant-scoped continuation information.
        meta:
          $ref: '#/components/schemas/ResponseMeta'
          description: Response context and completeness.
        resume_cursor:
          type: string
          minLength: 1
          description: >-
            Durable position after every change in this response; returned even
            for an empty page. Persist atomically with processed changes.
        cursor_expires_at:
          type: string
          format: date-time
      required:
        - data
        - page
        - meta
        - resume_cursor
        - cursor_expires_at
    Change:
      type: object
      properties:
        resource_type:
          type: string
          description: Changed resource type.
        resource_id:
          type: string
          description: Changed resource ID.
        resource_version:
          type: integer
          description: Version changed.
        action:
          $ref: '#/components/schemas/Enum_event_action'
          description: created, updated or deleted.
        changed_at:
          type: string
          format: date-time
          description: AMLOK change timestamp.
        sequence:
          type: integer
          minimum: 1
          description: >-
            Monotonic workspace change sequence. Gaps are valid when filtering
            resource types.
      required:
        - resource_type
        - resource_id
        - resource_version
        - action
        - changed_at
        - sequence
    Page:
      type: object
      properties:
        next_cursor:
          anyOf:
            - type: string
            - type: 'null'
          description: Opaque cursor for subsequent page; null after final page.
        has_more:
          type: boolean
          description: Whether more authorized records remain.
        limit:
          type: integer
          description: Applied result limit, from 1 to 200 in this contract.
          minimum: 1
          maximum: 200
      required:
        - has_more
        - limit
    ResponseMeta:
      type: object
      properties:
        request_id:
          type: string
          description: AMLOK request correlation ID.
        schema_version:
          type: string
          description: Serialization contract version.
        generated_at:
          type: string
          format: date-time
          description: Response generation time, not source data freshness.
        data_status:
          $ref: '#/components/schemas/Enum_data_status'
          description: Completeness of this response within its declared scope.
        coverage:
          anyOf:
            - $ref: '#/components/schemas/Coverage'
            - type: 'null'
          description: Requested and achieved source/time coverage.
      required:
        - request_id
        - schema_version
        - generated_at
        - data_status
    ErrorEnvelope:
      type: object
      properties:
        error:
          $ref: '#/components/schemas/Error'
        meta:
          $ref: '#/components/schemas/ResponseMeta'
      required:
        - error
        - meta
    Enum_event_action:
      type: string
      enum:
        - created
        - updated
        - deleted
    Enum_data_status:
      type: string
      enum:
        - complete
        - partial
        - unavailable
        - pending
    Coverage:
      type: object
      properties:
        requested_from:
          anyOf:
            - type: string
              format: date
            - type: 'null'
          description: Inclusive start requested.
        requested_to:
          anyOf:
            - type: string
              format: date
            - type: 'null'
          description: Exclusive end requested.
        available_from:
          anyOf:
            - type: string
              format: date
            - type: 'null'
          description: Earliest actual coverage.
        available_to:
          anyOf:
            - type: string
              format: date
            - type: 'null'
          description: Exclusive end of actual coverage.
        source_ids:
          type: array
          items:
            type: string
          description: Sources actually contributing.
        missing_intervals:
          type: array
          items:
            $ref: '#/components/schemas/Interval'
          description: Known gaps within requested scope.
        jurisdictions_completed:
          anyOf:
            - type: array
              items:
                type: string
            - type: 'null'
          description: Completed geographic search scope when applicable.
      required:
        - source_ids
        - missing_intervals
    Error:
      type: object
      properties:
        code:
          type: string
          description: Stable machine-readable error code.
        message:
          type: string
          description: Safe caller-facing explanation.
        field:
          anyOf:
            - type: string
            - type: 'null'
          description: Invalid request field when relevant.
        retryable:
          type: boolean
          description: Whether retry may succeed without changing the request.
        request_id:
          type: string
          description: Correlation identifier for support.
      required:
        - code
        - message
        - retryable
        - request_id
    Interval:
      type: object
      properties:
        from:
          type: string
          format: date
          description: Inclusive interval start.
        to:
          type: string
          format: date
          description: Exclusive interval end.
      required:
        - from
        - to
  responses:
    Error400:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            invalid_request:
              summary: invalid_request
              value:
                error:
                  code: invalid_request
                  message: Malformed input, unknown parameter or incompatible filters.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
            unsupported_parameter:
              summary: unsupported_parameter
              value:
                error:
                  code: unsupported_parameter
                  message: Historical query or filter not implemented on this resource.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
            validation_error:
              summary: validation_error
              value:
                error:
                  code: validation_error
                  message: >-
                    A field, projection, or request value is invalid. Inspect
                    error.field.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error401:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            unauthenticated:
              summary: unauthenticated
              value:
                error:
                  code: unauthenticated
                  message: Missing, expired or invalid credential.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error403:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            forbidden:
              summary: forbidden
              value:
                error:
                  code: forbidden
                  message: Tenant scope or field/product entitlement missing.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error404:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            not_found:
              summary: not_found
              value:
                error:
                  code: not_found
                  message: Record does not exist or is not visible in this tenant.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error410:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            cursor_expired:
              summary: cursor_expired
              value:
                error:
                  code: cursor_expired
                  message: >-
                    The synchronization cursor has expired. Begin a new
                    synchronization checkpoint and rebuild the collection
                    snapshot.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error429:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
        Retry-After:
          description: >-
            Delay in seconds or an HTTP-date. The example is illustrative, not a
            contractual quota.
          schema:
            type: string
          example: '30'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            rate_limited:
              summary: rate_limited
              value:
                error:
                  code: rate_limited
                  message: AMLOK tenant quota or upstream throttle.
                  retryable: true
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error500:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            internal_error:
              summary: internal_error
              value:
                error:
                  code: internal_error
                  message: Unexpected AMLOK processing error.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error502:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            source_error:
              summary: source_error
              value:
                error:
                  code: source_error
                  message: Upstream returned invalid or failed data.
                  retryable: false
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
    Error503:
      description: Request failed. Inspect error.code and error.retryable.
      headers:
        X-Request-ID:
          description: AMLOK response correlation identifier.
          schema:
            type: string
          example: req_example
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
          examples:
            source_unavailable:
              summary: source_unavailable
              value:
                error:
                  code: source_unavailable
                  message: Required source temporarily unavailable.
                  retryable: true
                  request_id: req_example
                meta:
                  request_id: req_example
                  schema_version: 1.4.2
                  generated_at: '2026-10-23T14:00:00Z'
                  data_status: complete
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API key
      description: >-
        Server-to-server API key bound to exactly one workspace, institution
        tenant and environment. No caller-supplied workspace override is
        accepted. Do not use in public browser code.

````

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