> ## Documentation Index > Fetch the complete documentation index at: https://docs.merchkit.com/llms.txt > Use this file to discover all available pages before exploring further. # List a product's variants > The products whose `parent_id` is this product, as full resources. ## OpenAPI ````yaml https://www.merchkit.com/api/v1/openapi get /products/{id}/variants openapi: 3.1.0 info: title: Merchkit API version: 1.0.0 description: >- Operate your Merchkit PIM programmatically. Products, images, vendors, categories, and data sources are all "entities" in one uniform shape: system fields (`id`, `type`, `label`, `parent_id`, timestamps) at the top level and every customer-defined key — scalars AND references — in a sparse `attributes` map. References read as labeled stubs `{id, type, label}` and write as bare UUIDs or `{id}` objects ("write what you read"). UUIDs are the only path identifiers; find by your own key with a filter (`GET /products?filter[sku]=ARIA-DT-72`) or write by it with `POST /{resource}/upsert` and `/batch` (products, images, vendors, and categories only — sources have neither route; they are created by the async `POST /sources` job pipeline). Start every integration with `GET /attributes?type=product` to learn your keys. Completeness is per-channel. All errors share one envelope (see the `Error` schema). Authenticate with a workspace-scoped API key: `Authorization: Bearer mk_live_...`. See /llms.txt for an agent guide. servers: - url: https://www.merchkit.com/api/v1 description: Merchkit API v1 security: - ApiKeyAuth: [] paths: /products/{id}/variants: parameters: - name: id in: path required: true schema: type: string format: uuid description: The resource UUID. get: summary: List a product's variants description: The products whose `parent_id` is this product, as full resources. operationId: listProductVariants parameters: - name: limit in: query schema: type: integer minimum: 1 maximum: 200 default: 50 description: Page size, 1–200 (default 50). - name: offset in: query schema: type: integer minimum: 0 default: 0 description: Zero-based offset, echoed back in `pagination.offset`. responses: '200': description: A page of variant products. content: application/json: schema: type: object properties: data: type: array items: $ref: '#/components/schemas/EntityResource' pagination: $ref: '#/components/schemas/Pagination' example: data: - id: 3c77a1de-52b9-4f0c-8a4e-91d2c6b7e803 type: product label: Aria Oak Dining Table 96" parent_id: 9b2f6c1e-8a04-4c6e-b0d3-5f2f6f7a9e21 created_at: '2026-06-02T14:11:09Z' updated_at: '2026-07-18T09:30:22Z' attributes: sku: ARIA-DT-96 product_name: Aria Oak Dining Table 96" price: 1699 material: White Oak pagination: total: 128 limit: 50 offset: 0 has_more: true '404': description: Product not found. content: application/json: schema: $ref: '#/components/schemas/Error' security: - ApiKeyAuth: [] components: schemas: EntityResource: type: object description: >- The one shape for every entity read and mutation response. System fields live at the top level; every customer-defined key lives in `attributes`, so customer keys can never collide with system ones. required: - id - type - label - parent_id - created_at - updated_at - attributes properties: id: type: string format: uuid type: type: string enum: - product - image - vendor - category - source description: The entity type discriminator. label: type: - string - 'null' description: >- The workspace's primary-attribute value for this entity; null when no primary attribute is configured or it is unset (never a UUID posing as a name). Render `label ?? id`. parent_id: type: - string - 'null' format: uuid description: 'Parent entity id (products: the variant parent).' created_at: type: - string - 'null' format: date-time updated_at: type: - string - 'null' format: date-time attributes: type: object description: >- SPARSE map of customer-defined keys — only keys with values appear; a missing key means unset or not-applicable (read `attributes[key] ?? null`; never contains null or ""). Scalars are bare values; a single reference is a labeled stub; a list reference is a COMPLETE ordered stub array (no cap, array order = position order). Inverse-reference keys never appear — traverse them via filters or `/products/{id}/references`. The full key list comes from `GET /attributes`. additionalProperties: $ref: '#/components/schemas/AttributeValue' example: id: 9b2f6c1e-8a04-4c6e-b0d3-5f2f6f7a9e21 type: product label: Aria Oak Dining Table parent_id: null created_at: '2026-06-02T14:11:09Z' updated_at: '2026-07-18T09:30:22Z' attributes: sku: ARIA-DT-72 product_name: Aria Oak Dining Table price: 1299 material: White Oak vendor: id: 77e1b2aa-6b3d-4f19-9d10-8c2a5e7f4b21 type: vendor label: Nordic Timber Co. category: id: c41d09f3-2e85-47a6-b93c-d5f8e1a20c67 type: category label: Dining Tables gallery_images: - id: f0a1b2c3-d4e5-4f60-8a7b-9c0d1e2f3a4b type: image label: aria-hero.jpg - id: f0a2c3d4-e5f6-4a70-9b8c-0d1e2f3a4b5c type: image label: aria-detail.jpg - id: f0a3d4e5-f6a7-4b80-8c9d-1e2f3a4b5c6d type: image label: aria-side.jpg - id: f0a4e5f6-a7b8-4c90-9dae-2f3a4b5c6d7e type: image label: aria-lifestyle.jpg - id: f0a5f6a7-b8c9-4da0-8ebf-3a4b5c6d7e8f type: image label: aria-packshot.jpg Pagination: type: object properties: total: type: integer limit: type: integer offset: type: integer description: The exact requested offset, echoed back. has_more: type: boolean example: total: 128 limit: 50 offset: 0 has_more: true Error: type: object description: >- The one error envelope every non-2xx response uses. `documentation_url` links to the code's section of the error docs. required: - error properties: error: type: object required: - code - message - is_retriable properties: code: type: string enum: - unauthorized - insufficient_scope - forbidden - not_found - validation_failed - rate_limited - conflict - internal_error message: type: string documentation_url: type: string format: uri description: https://docs.merchkit.com/developers/errors# is_retriable: type: boolean description: >- Only `rate_limited` and `internal_error` are retriable. Deterministic client errors (validation, not-found, conflict) return a 4xx and are never retriable. retry_after_seconds: type: - integer - 'null' alternative_action: type: string description: What to do instead, when there is a better call. request_id: type: string field_errors: type: array items: $ref: '#/components/schemas/FieldError' example: error: code: validation_failed message: 'Unknown attribute key(s): colour.' documentation_url: https://docs.merchkit.com/developers/errors#validation_failed is_retriable: false retry_after_seconds: null alternative_action: List valid attribute keys via GET /v1/attributes?type=product. request_id: req_01j9x2k8 field_errors: - field: colour issue: not_a_defined_attribute AttributeValue: description: >- A read value: a bare scalar (string/number/boolean), a single reference stub, or a complete ordered array of reference stubs. oneOf: - type: string - type: number - type: boolean - $ref: '#/components/schemas/ReferenceStub' - type: array items: $ref: '#/components/schemas/ReferenceStub' FieldError: type: object required: - field - issue properties: field: type: string issue: type: string description: Machine-readable issue code, e.g. `not_a_defined_attribute`. acceptable_values: type: array items: type: string description: 'For select-value violations: the allowed values.' ReferenceStub: type: object description: >- A labeled pointer to another entity. Fetch the full record via `GET /{type plural}/{id}` when needed — the label is inline so list rendering needs no extra lookups. required: - id - type - label properties: id: type: string format: uuid type: type: string enum: - product - image - vendor - category - source label: type: - string - 'null' description: The referenced entity's label (same null rule). example: id: 77e1b2aa-6b3d-4f19-9d10-8c2a5e7f4b21 type: vendor label: Nordic Timber Co. securitySchemes: ApiKeyAuth: type: http scheme: bearer description: >- Workspace-scoped API key. Available scopes: - `read:products`: List and read products, including variants, references, and completeness. - `write:products`: Create, update, and upsert products and their attribute values. - `delete:products`: Delete products. - `read:images`: List and read images. - `write:images`: Create, update, and upsert images and their attribute values. - `delete:images`: Delete images. - `read:vendors`: List and read vendors. - `write:vendors`: Create, update, and upsert vendors and their attribute values. - `delete:vendors`: Delete vendors. - `read:categories`: List and read categories. - `write:categories`: Create, update, and upsert categories and their attribute values. - `delete:categories`: Delete categories. - `read:sources`: List and read data sources, including scraped content. - `write:sources`: Create data sources (triggers processing) and update their attribute values. - `delete:sources`: Delete data sources. - `read:attributes`: List and read attribute definitions. - `write:attributes`: Create and update attribute definitions. - `read:views`: List and read saved grid views (MCP surface). - `write:views`: Create and update grid views (MCP surface). - `read:channels`: Read the enabled channel catalog. - `read:events`: Read the workspace change feed and per-entity events. - `read:jobs`: List and poll asynchronous job status. ````