> ## 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. # The reconciliation audit of one bank account, with the door for each finding > The whole reconciliation audit of ONE bank account in one call: the answers an accountant gives when proving a migrated or reconnected account, in the order they must be fixed. Five answers are returned under `answers`: `feed_against_bank` (does the bank feed reproduce the bank's own balance today and at each month end), `duplicates_and_exclusions` (any bank event live twice; every exclusion, split into system and human, and any human exclusion with no live twin), `books_against_bank` (the posted books against the bank at each month end, with the unpaired bank rows and unpaired book lines listed), `clearing_accounts` (each clearing account this bank feeds, against the money genuinely in flight) and `error_classes` (a row matched to a reversed entry, an entry whose lines are all one account, a payment recorded on a bank that did not pay it, a fee booked twice). Every item in `findings` names its `class`, the audit `step` it belongs to (1 to 7), its `severity` (`blocking` or `review`) and the `door` that fixes it (`match`, `undo`, `move_to_this_bank_and_match`, `restore` or `review`). `next_step` is one sentence naming the lowest-numbered blocking step, because a feed problem is fixed before the books are looked at and the baseline is set last. Steps 4 and 7 are judgements and are marked unanswered in `method.steps`. A count is never a page size: every list is capped by `row_limit` and publishes its unbounded total beside the rows it listed. A figure this audit cannot derive is `null`, never `0`. READ-ONLY. It writes nothing, posts nothing and calls no third party: every bank figure comes from persisted state through the same engine as `bank-balance-as-of`, so the two cannot disagree. It is not cheap: a migrated book of several hundred thousand entries takes seconds, so ask for the month ends you need. The bank account must belong to the entity of the key and be mapped to a general ledger account; otherwise the answer is 404 `bank_account_not_found`. Requires `accounting:read` or `migration:read` scope. ## OpenAPI ````yaml /openapi.yaml get /entities/{entity_id}/reconciliation/account-audit 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: /entities/{entity_id}/reconciliation/account-audit: get: tags: - Reconciliation summary: >- The reconciliation audit of one bank account, with the door for each finding description: > The whole reconciliation audit of ONE bank account in one call: the answers an accountant gives when proving a migrated or reconnected account, in the order they must be fixed. Five answers are returned under `answers`: `feed_against_bank` (does the bank feed reproduce the bank's own balance today and at each month end), `duplicates_and_exclusions` (any bank event live twice; every exclusion, split into system and human, and any human exclusion with no live twin), `books_against_bank` (the posted books against the bank at each month end, with the unpaired bank rows and unpaired book lines listed), `clearing_accounts` (each clearing account this bank feeds, against the money genuinely in flight) and `error_classes` (a row matched to a reversed entry, an entry whose lines are all one account, a payment recorded on a bank that did not pay it, a fee booked twice). Every item in `findings` names its `class`, the audit `step` it belongs to (1 to 7), its `severity` (`blocking` or `review`) and the `door` that fixes it (`match`, `undo`, `move_to_this_bank_and_match`, `restore` or `review`). `next_step` is one sentence naming the lowest-numbered blocking step, because a feed problem is fixed before the books are looked at and the baseline is set last. Steps 4 and 7 are judgements and are marked unanswered in `method.steps`. A count is never a page size: every list is capped by `row_limit` and publishes its unbounded total beside the rows it listed. A figure this audit cannot derive is `null`, never `0`. READ-ONLY. It writes nothing, posts nothing and calls no third party: every bank figure comes from persisted state through the same engine as `bank-balance-as-of`, so the two cannot disagree. It is not cheap: a migrated book of several hundred thousand entries takes seconds, so ask for the month ends you need. The bank account must belong to the entity of the key and be mapped to a general ledger account; otherwise the answer is 404 `bank_account_not_found`. Requires `accounting:read` or `migration:read` scope. operationId: getReconciliationAccountAudit parameters: - name: entity_id in: path required: true schema: type: string format: uuid - name: bank_account_id in: query required: true schema: type: string format: uuid - name: as_of in: query description: YYYY-MM-DD. Defaults to today. schema: type: string format: date - name: month_ends in: query description: How many month ends before `as_of` to test, 1 to 36. schema: type: integer minimum: 1 maximum: 36 - name: since in: query description: >- YYYY-MM-DD. Limits the clearing and error-class answers to activity on or after this day. schema: type: string format: date - name: pairing_window_days in: query description: >- How many days apart an unpaired bank row and an unpaired book line of the same amount may be and still be offered as a pair. schema: type: integer - name: error_window_days in: query description: >- How many days apart two same-amount vendor payments may be and still be reported as a possible double payment. schema: type: integer - name: row_limit in: query description: >- The most rows any one list returns. Each list still publishes its unbounded total. schema: type: integer responses: '200': description: The audit of that bank account content: application/json: schema: type: object properties: object: type: string enum: - reconciliation_account_audit entity_id: type: string format: uuid bank_account: type: object description: >- The account audited, its mapped general ledger account and the bank's last persisted balance. properties: id: type: string format: uuid name: type: string last4: type: string nullable: true gl_account_id: type: string format: uuid gl_account_number: type: string gl_account_name: type: string normal_balance: type: string plaid_connected: type: boolean bank_stated_balance: type: number format: double nullable: true bank_stated_as_of: type: string format: date-time nullable: true baseline_date: type: string format: date nullable: true baseline_balance: type: number format: double nullable: true as_of: type: string format: date month_ends: type: array items: type: string format: date since: type: string format: date nullable: true method: type: object description: >- The audit method's steps, and which of them this read answers. properties: document: type: string steps: type: array items: type: object properties: key: type: string step: type: integer answered: type: boolean title: type: string answers: type: object description: >- The five answers, each with its own figures, rows and findings. properties: feed_against_bank: type: object duplicates_and_exclusions: type: object books_against_bank: type: object clearing_accounts: type: object error_classes: type: object findings: type: array items: type: object properties: class: type: string step: type: integer door: type: string enum: - match - undo - move_to_this_bank_and_match - restore - review severity: type: string enum: - blocking - review headline: type: string detail: type: string amount: type: number format: double nullable: true count: type: integer nullable: true finding_count: type: integer blocking_count: type: integer next_step: type: string writes_nothing: type: boolean '400': $ref: '#/components/responses/Error' '401': $ref: '#/components/responses/Error' '403': $ref: '#/components/responses/Error' '404': $ref: '#/components/responses/Error' security: - ApiKeyAuth: [] components: responses: Error: description: Error response (400/401/403/404/409/422/429/500) content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' schemas: 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 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. ````