> ## Documentation Index
> Fetch the complete documentation index at: https://docs.depict.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Replace a product grouping's head and tails

> Replaces the grouping's head and tails; collections that activated it pick up the change. Writes config.lite_product_attachment; returns the grouping.



## OpenAPI

````yaml /api-reference/openapi/lite.json put /{merchant_id}/product-attachments/{attachment_id}
openapi: 3.1.0
info:
  title: Search & Merchandising API
  version: 1.0.0
  description: >-
    REST API behind Depict: Search & Merchandising, the native Shopify app:
    onboarding, collections, boost & bury, dashboards, A/B testing and
    multi-store management. Endpoints are served under the /api/lite prefix and
    are authenticated with the Shopify session token that App Bridge issues to
    the embedded app.
servers:
  - url: /api/lite
security:
  - ShopifySessionToken: []
paths:
  /{merchant_id}/product-attachments/{attachment_id}:
    put:
      summary: Replace a product grouping's head and tails
      description: >-
        Replaces the grouping's head and tails; collections that activated it
        pick up the change. Writes config.lite_product_attachment; returns the
        grouping.
      operationId: updateProductAttachment
      parameters:
        - schema:
            type: string
            description: Lite merchant id, e.g. `shopify-<shop id>`.
          required: true
          description: Lite merchant id, e.g. `shopify-<shop id>`.
          name: merchant_id
          in: path
        - schema:
            type: string
            format: uuid
          required: true
          name: attachment_id
          in: path
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProductAttachmentWriteInput'
      responses:
        '200':
          description: The updated grouping.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ProductAttachmentDefinition'
        '400':
          description: >-
            The body failed the schema, or the grouping is invalid (no tails,
            the head is a tail, duplicate tails); `detail` is user-facing copy.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Detail'
        '401':
          description: Not authenticated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Detail'
        '403':
          description: Authenticated, but this identity may not call the API.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Detail'
        '404':
          description: Merchant not found, groupings not enabled, or no such grouping.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Detail'
        '500':
          description: Internal error.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Detail'
components:
  schemas:
    ProductAttachmentWriteInput:
      type: object
      properties:
        head_product_id:
          type: string
        tail_product_ids:
          type: array
          items:
            type: string
          description: At least one, unique, and not the head.
      required:
        - head_product_id
        - tail_product_ids
    ProductAttachmentDefinition:
      type: object
      properties:
        id:
          type: string
        merchant_id:
          type: string
        head_product_id:
          type: string
        tail_product_ids:
          type: array
          items:
            type: string
          description: 'Ordered: the tails are laid out behind the head in this order.'
        created_at:
          type: string
        updated_at:
          type: string
      required:
        - id
        - merchant_id
        - head_product_id
        - tail_product_ids
        - created_at
        - updated_at
    Detail:
      type: object
      properties:
        detail:
          type: string
      required:
        - detail
      description: 'Every 4xx/5xx body: `{detail}`.'
  securitySchemes:
    ShopifySessionToken:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        Shopify App Bridge session token of the embedded Depict: Search &
        Merchandising app. The shop in the token determines the merchant;
        merchant_id parameters must belong to that shop.

````