> ## Documentation Index > Fetch the complete documentation index at: https://docs.arcuserp.com/llms.txt > Use this file to discover all available pages before exploring further. # Retrieve an audit log entry > Returns the full detail of a single audit log entry: the actor, timestamp, resource, action performed, and a structured record of what changed. Requires `audit:read` scope. ## OpenAPI ````yaml /openapi.yaml get /audit_log_entries/{id} openapi: 3.1.0 info: title: Arcus ERP Public API version: 1.0.0 description: > Arcus ERP public REST API. Designed for external integrations and data migration. **Authentication.** Bearer token (API key) via the `Authorization` header. Format: `Authorization: Bearer ark_live_ent__` (or `ark_test_*` for sandbox). API keys are issued per-entity in **Settings > Developers > API Keys**. **Entity scoping.** The entity is encoded in the API key prefix; routes are flat (e.g. `/v1/accounts`, `/v1/orders`, `/v1/products`). A small set of platform endpoints (migration, reconciliation, events, webhook endpoints, API keys) use the `/v1/entities/{entity_id}/...` form -- those are noted in their tags. **Key capabilities.** - Related-resource hydration via `?expand[]=` (see `x-arcus-expand` on each resource). - Cursor-based pagination (`starting_after` / `ending_before` / `limit`). - Idempotency via the `Idempotency-Key` header. - Webhook events for asynchronous notification. - Conditional requests / ETag for cache validation. **Changelog.** Entries are dated and name every published contract whose MEANING moved, not only the ones whose field names changed. The narrative version of the same entries, written for integrators, is published at https://arcuserp.mintlify.app/changelog. **2026-09-22 (planned 2026-09-21), REORDER-BUYER-TRUTH: demand changed what it MEANS on three published contracts, with no field renamed.** An integrator that pins field names sees no breakage and different numbers, which is why this entry exists. - **Demand now counts build consumption.** `demand_avg_per_day` on the public product, kit and inventory-balance objects, and `daily_demand` / `demand_basis` / `net_suggested_qty` on `GET /v1/purchasing/reorder-report`, are composed from fulfilled sales lines PLUS posted `build_consume` inventory draws: each physical decrement of a product counts exactly once. The previous rule adopted an internal-consumption basis only when the sales blend was exactly zero, so a product both sold AND consumed into work orders planned as if the build draws did not exist. Products drawn into work orders move; on one production-shaped dataset five did, the largest from 0.05/day to 14.95/day. - **`demand_basis` now carries four values, not two:** `sales`, `sales_and_builds`, `builds` and `consumption`. A consumer with a two-branch reader (anything that is not `consumption` is `sales`) silently hides the two new ones. - **`current_demand_units` on `GET /v1/inventory/balances/:id` moved, by a second rule.** It counts committed-but-unshipped CUSTOMER demand, and it now counts a kit component's own line rather than its parent kit line, and excludes non-sales documents. On one production dataset 269 of 1,043 balance rows changed, 227 of them downward; the largest single move was 1,941 to 25, on a product whose open PURCHASE order line had been reported as customer demand. Re-baseline anything that alerts or reorders off this field. - `run_rate_30/90/180/365` and `blended_daily` on the same balance object move for the first reason above. - **Added, not changed:** `GET /v1/purchasing/reorder-report` accepts `demand_window` and returns the unit, cover-through and reorder-point-provenance fields documented on that operation; `order_multiple` is accepted and returned on the product-vendor doors. - **Volume note.** The `inventory.low_stock`, `inventory.out_of_stock` and `inventory.back_in_stock` webhook events are population-gated on `on_hand <= reorder_point`, and reorder points move with the demand above, so subscribers should expect a one-time step change in event volume around the release. servers: - url: https://api.arcuserp.com/v1 description: Arcus ERP API (accepts both live `ark_live_*` and test `ark_test_*` keys) - url: https://dev-api.arcuserp.com/v1 description: >- Dev sandbox API (test-only data, accepts `ark_test_*` keys against dev RDS) security: [] paths: /audit_log_entries/{id}: get: tags: - AuditLog summary: Retrieve an audit log entry description: >- Returns the full detail of a single audit log entry: the actor, timestamp, resource, action performed, and a structured record of what changed. Requires `audit:read` scope. operationId: getAuditLogEntry parameters: - name: id in: path required: true schema: type: string format: uuid - name: expand in: query required: false schema: type: array items: type: string enum: - actor - resource - diff - chain explode: true description: | actor: resolve actor name/email from users table. resource: join full resource row (product, order, account, etc.). diff: include before_state, after_state, diff JSONB. chain: include prev_hash, entry_hash, archived_at. responses: '200': description: Single audit log entry content: application/json: schema: $ref: '#/components/schemas/AuditLogEntry' '401': $ref: '#/components/responses/Error' '403': $ref: '#/components/responses/Error' '404': $ref: '#/components/responses/Error' security: - ApiKeyAuth: [] components: schemas: AuditLogEntry: type: object description: > A single audit log entry from activity_log. Audit log entries are created automatically by canonical handlers via logActivity() and are immutable. The public API exposes read-only access only (Rule 20, append-only design). Chain integrity fields (prev_hash, entry_hash) are included when expand[]=chain is requested. properties: id: type: string format: uuid object: type: string enum: - audit_log_entry entity_id: type: string format: uuid actor: type: object description: Actor who performed the action. Resolved from metadata.actor JSONB. properties: type: type: string enum: - user - api_key - system - webhook id: type: string nullable: true label: type: string nullable: true name: type: string nullable: true description: Present when expand[]=actor. email: type: string nullable: true description: Present when expand[]=actor. on_behalf_of_user_id: type: string nullable: true action: type: string description: Dot-namespaced action slug, e.g. order.created. resource: type: object properties: type: type: string id: type: string format: uuid nullable: true label: type: string nullable: true description: type: string nullable: true metadata: type: object nullable: true description: >- Arbitrary JSONB payload. Internal keys (_actor, _api_key_id, etc.) prefixed with underscore. ip_address: type: string nullable: true user_agent: type: string nullable: true session_id: type: string nullable: true request_id: type: string nullable: true severity: type: string enum: - info - warning - critical - security nullable: true outcome: type: string enum: - success - failure nullable: true error_code: type: string nullable: true before_state: nullable: true description: State before the action. Present when expand[]=diff. after_state: nullable: true description: State after the action. Present when expand[]=diff. diff: nullable: true description: Computed diff of before/after state. Present when expand[]=diff. _chain: type: object nullable: true description: Cryptographic chain fields. Present when expand[]=chain. properties: prev_hash: type: string nullable: true entry_hash: type: string nullable: true archived_at: type: string format: date-time nullable: true created_at: type: string format: date-time ErrorEnvelope: type: object description: | Canonical error response envelope. All API errors use this shape. required: - error - code properties: error: type: string description: Machine-readable error key example: not_found code: type: string description: Machine-readable error code (often same as error) example: not_found type: type: string enum: - validation_error - permission_error - not_found - conflict - rate_limit - internal - expand_error - not_implemented example: not_found hint: type: string description: Human-readable one-sentence explanation (English) example: >- The requested order does not exist or does not belong to this entity. param: type: string description: The parameter that caused the error, if applicable example: expand[0] required: type: string description: The scope required (only on insufficient_scope errors) example: accounts:read request_id: type: string description: >- Unique request ID for support tracing (maps to CloudWatch log stream) example: req_abc123 responses: Error: description: Error response (400/401/403/404/409/422/429/500) content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' securitySchemes: ApiKeyAuth: type: http scheme: bearer description: | API key issued per entity via Settings > Developers > API Keys. Each key carries scopes (e.g. orders:read, products:write). Bearer token format: Authorization: Bearer ark_live_ent__ Test keys use ark_test_ent__. Both are issued per entity via Settings > Developers > API Keys. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.