> ## 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 a freight package (pallet, crate, custom) > Inserts a `fulfillment.packages` row tagged with freight-specific fields (NMFC class, NMFC code, pallet count, declared value, accessorials, dimensions). The order must already be flagged as freight (`assertOrderIsFreight` gate, returns 400 `order_not_freight` otherwise). The canonical handler emits an `order.package_added` realtime broadcast plus a `freight.package_added` activity log entry. Idempotent on `Idempotency-Key`. Requires the `orders:write` scope. Note: is_hazmat and hazmat_details removed 2026-05-22 (HAZMAT-SCRUB). ## OpenAPI ````yaml /openapi.yaml post /freight_orders/{id}/packages 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: /freight_orders/{id}/packages: parameters: - name: id in: path required: true schema: type: string format: uuid post: tags: - Freight summary: Create a freight package (pallet, crate, custom) description: > Inserts a `fulfillment.packages` row tagged with freight-specific fields (NMFC class, NMFC code, pallet count, declared value, accessorials, dimensions). The order must already be flagged as freight (`assertOrderIsFreight` gate, returns 400 `order_not_freight` otherwise). The canonical handler emits an `order.package_added` realtime broadcast plus a `freight.package_added` activity log entry. Idempotent on `Idempotency-Key`. Requires the `orders:write` scope. Note: is_hazmat and hazmat_details removed 2026-05-22 (HAZMAT-SCRUB). operationId: createFreightPackageV1 parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: true content: application/json: schema: type: object properties: package_type: type: string enum: - pallet - crate - custom default: pallet freight_class: type: string description: >- NMFC freight class (50, 55, 60, 65, 70, 77.5, 85, 92.5, 100, 110, 125, 150, 175, 200, 250, 300, 400, 500). example: '100' nmfc_code: type: string nullable: true declared_value: type: number format: float minimum: 0 pallet_count: type: integer minimum: 1 example: 2 total_weight_lbs: type: number format: float minimum: 0 example: 1200 dimensions_json: type: object description: >- Free-form pallet dimensions object (e.g. { length: 48, width: 40, height: 60 } in inches). accessorials: type: array items: type: string description: >- Accessorial codes (LIFTGATE_DEL, INSIDE_DEL, RESIDENTIAL, NOTIFY, etc.). carrier: type: string nullable: true service: type: string nullable: true items: type: array description: >- Optional package_items rows to insert atomically with the package. items: type: object properties: order_item_id: type: string format: uuid quantity: type: number format: float minimum: 0 example: package_type: pallet freight_class: '100' pallet_count: 2 total_weight_lbs: 1200 declared_value: 5400 accessorials: - LIFTGATE_DEL responses: '201': description: Freight package created content: application/json: schema: type: object properties: data: type: object properties: id: type: string format: uuid order_id: type: string format: uuid package_type: type: string freight_class: type: string nullable: true pallet_count: type: integer nullable: true total_weight_lbs: type: number format: float nullable: true '400': description: >- order_not_freight, failed_to_create_freight_package, or validation error content: application/json: schema: $ref: '#/components/schemas/Error' '401': $ref: '#/components/responses/Error' '403': $ref: '#/components/responses/Error' '404': $ref: '#/components/responses/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: 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. ````