> ## 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. # Create an invoice document from a confirmed sales order > Generates the invoice record (a row in the canonical orders table with `document_type='invoice'`) from a confirmed sales order. Stamps the invoice number from the configured counter and posts the AR JE per the standard order-to-cash workflow. Distinct from `GET /v1/orders/invoices` (the collection list endpoint). Requires the `orders:write` scope. Idempotent via Idempotency-Key. **Historical import (migration only).** The body fields `is_historical_import`, `invoice_date`, and `posted_at` are migration-mode flags that bypass live AR/GL posting and stamp the caller-supplied dates. They are ONLY honored when the API key carries the `migration:write` scope (or `*`); ordinary `orders:write` keys have them silently ignored and ALWAYS receive standard order-to-cash AR/GL posting. Every grant emits an `api_key.migration_option_used` audit row. **Revision acknowledgment gate (HTTP 409 `revision_unacknowledged`).** If the order was revised after the customer received their copy and the customer has not yet acknowledged the new total, this endpoint returns HTTP 409 with `code: revision_unacknowledged`. Lift the gate via `POST /v1/orders/{id}/customer-acknowledge-revision`, or bypass with `?override=true` / `{"skip_revision_ack": true}` (requires `orders.revision_override` permission). The gate is bypassed automatically when `is_historical_import: true` is set for migration callers. ## OpenAPI ````yaml /openapi.yaml post /orders/{id}/invoice 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. 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: /orders/{id}/invoice: parameters: - name: id in: path required: true schema: type: string format: uuid post: tags: - Orders summary: Create an invoice document from a confirmed sales order description: > Generates the invoice record (a row in the canonical orders table with `document_type='invoice'`) from a confirmed sales order. Stamps the invoice number from the configured counter and posts the AR JE per the standard order-to-cash workflow. Distinct from `GET /v1/orders/invoices` (the collection list endpoint). Requires the `orders:write` scope. Idempotent via Idempotency-Key. **Historical import (migration only).** The body fields `is_historical_import`, `invoice_date`, and `posted_at` are migration-mode flags that bypass live AR/GL posting and stamp the caller-supplied dates. They are ONLY honored when the API key carries the `migration:write` scope (or `*`); ordinary `orders:write` keys have them silently ignored and ALWAYS receive standard order-to-cash AR/GL posting. Every grant emits an `api_key.migration_option_used` audit row. **Revision acknowledgment gate (HTTP 409 `revision_unacknowledged`).** If the order was revised after the customer received their copy and the customer has not yet acknowledged the new total, this endpoint returns HTTP 409 with `code: revision_unacknowledged`. Lift the gate via `POST /v1/orders/{id}/customer-acknowledge-revision`, or bypass with `?override=true` / `{"skip_revision_ack": true}` (requires `orders.revision_override` permission). The gate is bypassed automatically when `is_historical_import: true` is set for migration callers. operationId: createInvoiceV1 parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: false content: application/json: schema: type: object properties: is_historical_import: type: boolean description: | Migration-mode flag. When true AND the key carries `migration:write`, the invoice skips the AR/revenue JE (AR is loaded separately by the migration). Silently coerced to false for non-migration callers. invoice_date: type: string format: date nullable: true description: | Caller-supplied invoice date. Honored only when the key carries `migration:write`; ignored otherwise. posted_at: type: string format: date-time nullable: true description: | Caller-supplied GL posting timestamp. Honored only when the key carries `migration:write`; ignored otherwise. skip_revision_ack: type: boolean description: > When true, bypasses the revision acknowledgment gate. Requires the caller to have the `orders.revision_override` permission; returns 403 otherwise. Equivalent to the `?override=true` query parameter. responses: '201': description: Invoice created content: application/json: schema: $ref: '#/components/schemas/Order' '404': $ref: '#/components/responses/Error' '409': description: > Order cannot be invoiced (e.g. `revision_unacknowledged`: the order was revised after the customer received their copy and they have not yet acknowledged the new total; or the order is already invoiced). Pass `skip_revision_ack: true` with the `orders.revision_override` permission to bypass the revision gate. content: application/json: schema: $ref: '#/components/schemas/Error' security: - ApiKeyAuth: - orders:write components: parameters: IdempotencyKey: name: Idempotency-Key in: header required: false description: | Client-generated unique key for idempotent POST/PATCH/DELETE operations. Alias for the Idempotency parameter. Max 255 chars. On retry with the same key, the original response is returned without re-executing the operation. Keys expire after 24 hours. schema: type: string maxLength: 255 schemas: Order: type: object description: > An Arcus ERP order document. One table holds quotes, sales_orders, invoices, returns, and purchase_orders -- always filter by document_type. entity_id is always from the API key (Layer 1 isolation). properties: id: type: string format: uuid object: type: string enum: - order entity_id: type: string format: uuid readOnly: true order_number: type: string readOnly: true document_type: type: string enum: - quote - sales_order - invoice - return - purchase_order order_status: type: string enum: - draft - confirmed - partially_fulfilled - fulfilled - cancelled - voided - awaiting_ach_clearance - on_hold payment_status: type: string enum: - unpaid - partially_paid - paid - overpaid - refunded - partially_refunded - voided fulfillment_status: type: string enum: - unfulfilled - partially_fulfilled - fulfilled account_id: type: string format: uuid nullable: true location_id: type: string format: uuid nullable: true po_number: type: string nullable: true order_date: type: string format: date-time nullable: true due_date: type: string format: date-time nullable: true subtotal: type: number discount_total: type: number shipping_total: type: number tax_total: type: number fee_total: type: number order_total: type: number list_price_total: type: number readOnly: true description: >- Derived (display-only): SUM(list_price * qty) over non-kit lines. The gross baseline of the gross-to-net bridge (List price minus pricing_savings equals subtotal). Never part of order_total. pricing_savings: type: number readOnly: true description: >- Derived (display-only): SUM(pricing_rule_adjustment * qty) over non-kit lines (positive magnitude). Per-unit pricing-rule savings already baked into subtotal via sell_rate (ASC 606 transaction price); shown as an informational List-to-Subtotal bridge, never subtracted from order_total. amount_paid: type: number readOnly: true description: 'SSOT: utils/ar-helpers.mjs::updateARBalance. Do not write directly.' balance_due: type: number readOnly: true tax_exempt: type: boolean delivery_option: type: string enum: - ship - pick_up - local_delivery notes: type: string nullable: true internal_notes: type: string nullable: true invoice_number: type: string nullable: true readOnly: true invoice_type: type: string enum: - order - manual - proforma - correction nullable: true is_on_hold: type: boolean readOnly: true hold_type: type: string nullable: true readOnly: true ship_complete: type: boolean source_platform: type: string nullable: true external_order_id: type: string nullable: true external_order_number: type: string nullable: true metadata: type: object nullable: true created_at: type: string format: date-time readOnly: true updated_at: type: string format: date-time readOnly: true Error: description: | Alias for ErrorEnvelope. Canonical error response shape used by all API endpoints. Refer to ErrorEnvelope for the full field definition. allOf: - $ref: '#/components/schemas/ErrorEnvelope' 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. ````