# Update a variant > Partially update a variant using JSON Merge Patch. {/* generated:versioned-pages - edit _pm-authored, not this file */} `PATCH /api/products/{productId}/variants/{variantId}` Updates the Product Variant resource. Partially updates a variant. The body is a [JSON Merge Patch](https://datatracker.ietf.org/doc/html/rfc7396) document: any field you include replaces the current value, and any field you omit is left untouched. > **Merge Patch semantics** > > Omit a field to leave it untouched, or send a new value to replace it. Non-nullable fields such as `sku` and `barcode` reject `null` - you can change them but not clear them. ## Path parameters | Name | Type | Required | Description | | ----------- | -------- | -------- | -------------------------- | | `productId` | `string` | Yes | ProductResource identifier | | `variantId` | `string` | Yes | Product Variant identifier | ## Request body | Property | Type | Required | Description | | -------------- | ------------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `barcode` | `string` | - | The barcode, unique UPC, or ISBN number for the product. | | `measurement` | `EmbeddedMeasurementResource \| null` | - | The measurement used to compute per-unit prices for the variant. | | `medias` | `string[]` | - | A list of `Media`, ordered by position. Only media of type "image" can be associated with a variant. Returned as IRI strings by default; pass `?expand=medias` to embed full `Media` objects. Requires the `medias:read` scope. Returned empty when the scope is missing. | | `optionValues` | `string[]` | - | A list of `Option Value`, each one representing an option value associated with the variant. Requires the `products:read` scope. Returned empty when the scope is missing. | | `sku` | `string` | - | A unique identifier for the product variant. | ## Response **200** - Product Variant resource updated | Property | Type | Required | Description | | --------------- | ------------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `barcode` | `string` | Yes | The barcode, unique UPC, or ISBN number for the product. | | `createdAt` | `string` | - | The date and time when the resource was created (ISO 8601 format). | | `id` | `string` | - | The resource's unique identifier (UUID). | | `measurement` | `EmbeddedMeasurementResource \| null` | - | The measurement used to compute per-unit prices for the variant. | | `medias` | `array` | - | A list of `Media`, ordered by position. Only media of type "image" can be associated with a variant. Returned as IRI strings by default; pass `?expand=medias` to embed full `Media` objects. Requires the `medias:read` scope. Returned empty when the scope is missing. | | `metafields` | `array` | - | Metafields owned by this variant. Serialized as IRI strings by default; pass `?expand=metafields` to embed full `MetafieldResource` objects. Requires the `metafields:read` scope. Returned empty when the scope is missing. | | `optionValues` | `array` | - | A list of `Option Value`, each one representing an option value associated with the variant. Requires the `products:read` scope. Returned empty when the scope is missing. | | `product` | `string \| Product \| null` | Yes | The product resource it belongs to. Requires the `products:read` scope. Returned null when the scope is missing. | | `resolvedPrice` | `ResolvedPriceResource \| null` | - | The price resolved for the current `resolveContext` (country, channel and instant). Null unless `resolveContext[country]`, `resolveContext[channel]` and `resolveContext[at]` are all provided. | | `sku` | `string` | Yes | A unique identifier for the product variant. | | `updatedAt` | `string` | - | The date and time when the resource was last modified (ISO 8601 format). | ## Errors **400** - Invalid input | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------ | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `code` | `string` | - | Stable identifier of the error in the error code catalogue (see /api/error-codes). Present on catalogued errors only. | | `description` | `string \| null` | - | | | `detail` | `string \| null` | - | A human-readable explanation specific to this occurrence of the problem. | | `instance` | `string \| null` | - | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. | | `message` | `string` | - | End-user message localized in the request locale, with this occurrence's values substituted. Present on catalogued errors only. | | `slug` | `string` | - | Stable, readable key of the error in the error code catalogue. Present on catalogued errors only. | | `status` | `integer \| null` | - | | | `title` | `string \| null` | - | A short, human-readable summary of the problem. For a catalogued error it repeats the `slug`. | | `type` | `string` | - | A URI reference that identifies the problem type. For a catalogued error it is the error code resource, `/api/error-codes/{code}`. | **403** - Access denied. The caller is missing one or more permissions required for this operation. | Property | Type | Required | Description | | -------------------- | ------------------ | -------- | ---------------------------------------------------------------------------------------------------------------------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `detail` | `string` | - | | | `missingPermissions` | `string[]` | - | Permissions that the caller is missing for this operation. Present only when the 403 is caused by a denied permission. | | `status` | `integer` | - | | | `title` | `string` | - | | | `type` | `string` | - | | **404** - Not found | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------ | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `code` | `string` | - | Stable identifier of the error in the error code catalogue (see /api/error-codes). Present on catalogued errors only. | | `description` | `string \| null` | - | | | `detail` | `string \| null` | - | A human-readable explanation specific to this occurrence of the problem. | | `instance` | `string \| null` | - | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. | | `message` | `string` | - | End-user message localized in the request locale, with this occurrence's values substituted. Present on catalogued errors only. | | `slug` | `string` | - | Stable, readable key of the error in the error code catalogue. Present on catalogued errors only. | | `status` | `integer \| null` | - | | | `title` | `string \| null` | - | A short, human-readable summary of the problem. For a catalogued error it repeats the `slug`. | | `type` | `string` | - | A URI reference that identifies the problem type. For a catalogued error it is the error code resource, `/api/error-codes/{code}`. | **422** - An error occurred | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ----------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `description` | `string` | - | | | `detail` | `string` | - | | | `instance` | `string \| null` | - | | | `status` | `integer` | - | | | `title` | `string \| null` | - | | | `type` | `string` | - | | | `violations` | `object[]` | - | | ## Examples ### Example request ```bash curl -X PATCH 'https://.product-management.flowkiwi.net/api/products//variants/' \ -H 'Authorization: Bearer {access_token}' \ -H 'Flowkiwi-Api-Version: unstable' \ -H 'Accept: application/ld+json' \ -H 'Content-Type: application/merge-patch+json' \ -d '{ "optionValues": [ "/api/product_options/019af941-6b7c-7d8e-9f0a-2b3c4d5e6f70/option_values/e99b2cf9-fcea-5da3-b2ac-4a9f5e956928" ] }' ``` ### Example response ```json { "@context": "/api/contexts/Product%20Variant", "@id": "/api/products/019af93e-420e-79f8-800b-6680f03dce20/variants/b8da3511-02af-5f93-9fa6-78dad5ee48ac", "@type": "Product Variant", "barcode": "BAR-001-A", "createdAt": "2024-01-01T00:00:00+00:00", "id": "b8da3511-02af-5f93-9fa6-78dad5ee48ac", "measurement": { "measuredType": "weight", "quantityUnit": "g", "quantityValue": 500, "referenceUnit": "kg", "referenceValue": 1 }, "medias": [], "optionValues": [ "/api/product_options/019af941-6b7c-7d8e-9f0a-2b3c4d5e6f70/option_values/e44abe10-be24-5761-8b5c-60449673a513", "/api/product_options/019af941-6b7c-7d8e-9f0a-2b3c4d5e6f70/option_values/8d49ea97-1fbb-5c9d-aff0-7b404cbf6de8" ], "product": "/api/products/019af93e-420e-79f8-800b-6680f03dce20", "sku": "SKU-ABC-001", "updatedAt": "2024-01-01T00:00:00+00:00" } ```