> ## 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. # List tax codes > Returns the entity's product tax classification codes (e.g. AvaTax P0000000 generic tangible). Requires the `tax_codes:read` scope. Path alias `/tax_codes` (underscore) is accepted for back-compat but undocumented. ## OpenAPI ````yaml /openapi.yaml get /tax-codes 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: /tax-codes: get: tags: - Tax Codes summary: List tax codes description: | Returns the entity's product tax classification codes (e.g. AvaTax P0000000 generic tangible). Requires the `tax_codes:read` scope. Path alias `/tax_codes` (underscore) is accepted for back-compat but undocumented. operationId: listTaxCodesV1 parameters: - name: is_active in: query schema: type: boolean - name: category in: query schema: type: string - $ref: '#/components/parameters/Limit' - $ref: '#/components/parameters/StartingAfter' - $ref: '#/components/parameters/EndingBefore' responses: '200': description: Tax code list content: application/json: schema: type: object properties: object: type: string example: list data: type: array items: $ref: '#/components/schemas/TaxCode' has_more: type: boolean '401': $ref: '#/components/responses/Error' security: - ApiKeyAuth: - tax_codes:read components: parameters: Limit: name: limit in: query required: false description: | Maximum number of records to return per page. Default 25, max 500. Use together with starting_after for cursor pagination. For larger bulk extraction workflows prefer the migration endpoints. schema: type: integer minimum: 1 maximum: 500 default: 25 StartingAfter: name: starting_after in: query required: false description: | Cursor for pagination. Pass the id of the last record from the previous page to fetch the next page. Mutually exclusive with ending_before. schema: type: string maxLength: 200 EndingBefore: name: ending_before in: query required: false description: | Cursor for reverse pagination. Pass the id of the first record from the previous page to fetch the prior page. Mutually exclusive with starting_after. schema: type: string maxLength: 200 schemas: TaxCode: type: object description: > A tax classification code for products (e.g. AvaTax P0000000 generic tangible, ND040000 non-taxable digital, etc.). When AvaTax is the active jurisdiction provider, `avatax_tax_code` mirrors the canonical AvaTax tax code so jurisdiction sourcing flows through. Soft-delete refuses with HTTP 409 if any product still references the code (FK guard against orphaned product tax classification). Scope: tax_codes:read / tax_codes:write / tax_codes:delete. properties: id: type: string format: uuid readOnly: true object: type: string example: tax_code entity_id: type: string format: uuid readOnly: true code: type: string description: Operator-defined code unique per entity. 1..50 chars. name: type: string description: Human-readable label. 1..150 chars. description: type: string nullable: true taxable: type: boolean default: true description: If false, products with this code are exempt from sales tax. category: type: string nullable: true description: Optional grouping label (e.g. 'general', 'food', 'digital'). avatax_tax_code: type: string nullable: true description: Mirrors the AvaTax tax code when AvaTax is the active provider. is_active: type: boolean default: true external_source: type: string nullable: true external_id: type: string nullable: true metadata: type: object description: Free-form caller metadata. Default {}. deleted_at: type: string format: date-time nullable: true readOnly: true created_at: type: string format: date-time readOnly: true updated_at: type: string format: date-time readOnly: true 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. ````