> ## Documentation Index > Fetch the complete documentation index at: https://print.app/docs/llms.txt > Use this file to discover all available pages before exploring further. # Assign designs to a product > Sets which designs open for a product, and optionally per variant. Replaces the product's assignment; settings made in the dashboard are kept. ## OpenAPI ````yaml openapi.json PUT /v2/products/{productId} openapi: 3.1.0 info: title: Print.App API version: 2.1.0 description: >- Server-to-server API for Print.App integrations: designs and their page content, folders, files, fonts, palettes, product assignments, projects and editor links. Authenticate every request with a secret key: `Authorization: Bearer sk_…`. Never call it from a browser. servers: - url: https://api.print.app description: Production security: - bearerAuth: [] tags: - name: Account description: The account a secret key belongs to. - name: Designs description: >- The designs (templates) your customers start from: create them at a size, manage their pages, and place text, images and shapes on them. - name: Design folders description: >- Folders that organise your designs. A design can sit in more than one folder. - name: Files description: >- Your own images and graphics, used in designs and offered to customers in the editor. - name: Graphic folders description: >- Folders of files, shown in the editor under Pictures, Backgrounds, Textures or Frames. - name: Fonts description: >- The fonts your designs and customers can use: the built-in set, imported Google fonts and fonts you upload. - name: Palettes description: Colour palettes offered in the editor. - name: Products description: Which designs open for each product (and variant) in your store. - name: Projects description: Your customers' saved designs. - name: Links description: Shareable editor links that open a design or project at create.print.app. - name: Connectors description: >- Links between the options on a store's product page and the editor: the choice a customer makes shows the right pages, opens the right design, or sets the size, orientation or colour. Read a product page for what a connector can point at, and test one against a design before customers meet it. - name: Resource profiles description: >- Limits on the fonts, colour palettes and graphic folders the editor offers, for the designs that use them. - name: PDF profiles description: >- The settings print PDFs are made with: colour conversion, PDF standard, cut lines, image resolution, fonts. - name: 3D scenes description: >- The 3D scenes the editor previews designs on: models with print areas, folds, flipbooks and sheets, yours and the Print.App library's. A design picks one with `sceneId`. - name: Library description: >- The Print.App library, the store catalogue the dashboard's Import Designs and Import from Library open: ready-made designs, and themed kits of graphics. Find what suits a product, then bring it into your account: a design as your own copy, a kit as a folder that follows it, single graphics into a folder. - name: Settings description: >- The account's editor and product page settings: how the editor opens and behaves, and the selectors Print.App uses on your product pages. Settings that run code in your store, send data elsewhere or delete projects are kept to the dashboard. paths: /v2/products/{productId}: put: tags: - Products summary: Assign designs to a product description: >- Sets which designs open for a product, and optionally per variant. Replaces the product's assignment; settings made in the dashboard are kept. operationId: setProduct parameters: - name: productId in: path required: true schema: type: string description: The product's id in your store. requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ProductSet' example: designIds: - design_01J8Z9K2M3N4P5Q6R7S8T9V0W1 variants: - id: '4401' designIds: - design_01J8ZB0C1D2E3F4G5H6J7K8M9N responses: '200': description: OK. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Product' example: object: product id: '8812001' title: Business cards designIds: - design_01J8Z9K2M3N4P5Q6R7S8T9V0W1 variants: [] modified: '2026-10-27T10:00:00Z' '400': description: >- A parameter or body field is malformed: `param` names it and `details` lists every problem found. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: invalid_request message: width is required. param: width requestId: FZn-uhymjoEEJow= '401': description: Missing, unknown, revoked or expired secret key. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: unauthorized message: >- Missing or invalid secret key. Send it as "Authorization: Bearer sk_…". requestId: FZn-uhymjoEEJow= '403': description: The account is suspended for an unpaid invoice. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: account_suspended message: >- This account is suspended. Settle the outstanding invoice in the Print.App dashboard. requestId: FZn-uhymjoEEJow= '404': description: >- Not found in your account. Another account's resources answer 404 too. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: not_found message: Not found. requestId: FZn-uhymjoEEJow= '415': description: The body is not JSON. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: unsupported_media_type message: >- Send the request body as JSON, with "Content-Type: application/json". requestId: FZn-uhymjoEEJow= '429': description: >- Rate limited by the API gateway. Back off and retry. This response comes from the gateway, so its body is `{ "message": "Too Many Requests" }`, not the standard error. content: application/json: schema: $ref: '#/components/schemas/GatewayError' example: message: Too Many Requests '500': description: >- Something failed on our side. Retry; quote the requestId to support if it persists. headers: x-request-id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: true code: internal_error message: >- Something went wrong on our side. Retry the request; if it keeps failing, contact support with the requestId. requestId: FZn-uhymjoEEJow= components: schemas: ProductSet: title: ProductSet description: The designs a product opens. type: object additionalProperties: false required: - designIds properties: title: type: string minLength: 1 maxLength: 200 description: >- The product's name, shown in the dashboard. Default: the current one, or the product id. designIds: type: array maxItems: 50 uniqueItems: true items: type: string description: >- The designs the product opens, in order. `[]` leaves only the variants' designs. variants: type: array maxItems: 500 items: type: object additionalProperties: false required: - id - designIds properties: id: type: string minLength: 1 maxLength: 100 description: The variant's id in your store. title: type: string maxLength: 200 designIds: type: array maxItems: 50 uniqueItems: true items: type: string description: The designs this variant opens instead of the product's. description: >- Per-variant designs. Variants you leave out open the product's designs. examples: - designIds: - design_01J8Z9K2M3N4P5Q6R7S8T9V0W1 variants: - id: '4401' designIds: - design_01J8ZB0C1D2E3F4G5H6J7K8M9N Product: title: Product description: The designs one store product opens. type: object required: - object - id - title - designIds - variants - modified properties: object: type: string const: product id: type: string description: The product's id in your store. title: type: - string - 'null' designIds: type: array items: type: string variants: type: array items: type: object required: - id - title - designIds properties: id: type: string title: type: - string - 'null' designIds: type: array items: type: string description: Variants with their own designs. modified: type: - string - 'null' format: date-time examples: - object: product id: '8812001' title: Business cards designIds: - design_01J8Z9K2M3N4P5Q6R7S8T9V0W1 variants: [] modified: '2026-10-27T10:00:00Z' Error: title: Error description: >- Every error the API itself returns. Match on `code`; `message` is for people and may be reworded. type: object required: - error - code - message - requestId properties: error: type: boolean const: true code: type: string enum: - unauthorized - account_suspended - invalid_request - not_found - route_not_found - idempotency_key_reused - idempotency_in_progress - folder_not_empty - builtin_folder - builtin_palette - editor_not_supported - design_changed - payload_too_large - unsupported_media_type - ops_failed - internal_error - service_unavailable description: >- `unauthorized` (401): missing, unknown, revoked or expired secret key. `account_suspended` (403): the account has an unpaid invoice. `invalid_request` (400): a parameter or body field is malformed — see `param` and `details`. `not_found` (404): no such resource in your account. `route_not_found` (404): no such endpoint. `idempotency_key_reused` (409): the Idempotency-Key was used for a different request. `idempotency_in_progress` (409): the first request with that key is still running. `folder_not_empty` (409): the folder still holds designs or folders. `builtin_folder`, `builtin_palette` (409): Print.App's own folders and palettes cannot be changed. `editor_not_supported` (409): page content can only be edited on accounts that use the new editor. `design_changed` (409): the design was saved elsewhere while the batch ran; read it again and retry. `payload_too_large` (413): a body or file over the limit. `unsupported_media_type` (415): send JSON. `ops_failed` (422): an operation in the batch failed, nothing was saved — see `details`. `internal_error` (500): retry; contact support with the `requestId` if it persists. `service_unavailable` (503): retry in a few seconds. message: type: string param: type: string description: The parameter or body field at fault, as a path (`pages[0].title`). details: type: array description: >- Every problem found, when there was more than one (`invalid_request`), or each operation's result (`ops_failed`). items: type: object requestId: type: string description: >- Also sent as the `x-request-id` header. Quote it when contacting support. examples: - error: true code: invalid_request message: limit must be an integer from 1 to 100. param: limit requestId: FZn-uhymjoEEJow= GatewayError: type: object properties: message: type: string description: Returned by the API gateway itself (429). headers: RequestId: description: Identifies the request. Quote it when contacting support. schema: type: string securitySchemes: bearerAuth: type: http scheme: bearer description: >- A secret key from Print.App admin → Domains → Secret keys, sent as `Authorization: Bearer sk_…`. Server-side only. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.