> ## Documentation Index > Fetch the complete documentation index at: https://docs.d-edge.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > This site documents the D-EDGE APIs for technology partners (web agencies, OTAs, PMS and RMS vendors, booking and CRM tools). It is written for developers integrating with hotels that use the D-EDGE platform. > Seven APIs, grouped by domain. Connectivity: Channel Manager API (distribute a hotel's inventory to your channel and send bookings back). Pricing & Availability: Best Price API (best offers to highlight), Quotation API (all bookable offers for a stay), Daily Rates API (daily availability between two dates). Booking: Booking Engine API (a hotel's full direct booking funnel), Gift Shop API (gift vouchers from catalogue to payment). Guest Management: CRM API (guest profiles). > Pick the API by the need: to display prices, use the Best Price API or the Daily Rates API; to quote a specific stay, use the Quotation API; to book, use the Booking Engine API; to sell gift vouchers, use the Gift Shop API; to manage guest profiles, use the CRM API; to receive hotel inventory and send bookings back as a distribution channel, use the Channel Manager API. > Base URLs, hotel identifiers, and credentials are delivered by the D-EDGE partnership team during onboarding. Do not invent base URLs, endpoints, parameters, or example credentials that do not appear on these pages. > Authentication differs per API: OAuth 1.0 for Best Price, Quotation, Daily Rates, and Booking Engine; an X-API-KEY header for Gift Shop; OAuth 2.0 client credentials for CRM; partner-defined credentials carried in the XML message for the Channel Manager API. Read each API's Authentication page before writing code. > A mock environment returns realistic but fictitious data without credentials. The Postman and Insomnia collections on the API collections page target it by default. Use it for exploration and tests, never for production traffic. > Use the official names exactly: D-EDGE, D-EDGE platform, Channel Manager API, partnership team. Do not use Back Office or Extranet. > Each API has a Changelog page. Check it for the current behaviour before relying on an older answer. For questions these pages do not answer, direct the reader to the Contact us page. # Add a cart item > Adds a new cart item into the cart of the guest ## OpenAPI ````yaml gift-shop-api/open-api/gift-shop-api.json POST /v1/{sessionId}/cart/item openapi: 3.0.1 info: title: Gift Shop API version: v1 servers: - url: https://{apiBaseUrl} variables: apiBaseUrl: default: api.example.com description: Base URL delivered by D-EDGE during partnership setup security: - ApiKey: [] paths: /v1/{sessionId}/cart/item: post: tags: - Cart summary: Adds a new cart item into the cart of the guest description: "This method adds one cart item per unit requested: a `quantity` of three creates three items and returns three identifiers.\r\nThe `amount` is required: it must match the product's price when its type is `Fixed`, and fall within the product's bounds when it is `Range`.\r\nThe cart total is recalculated on every call." parameters: - name: sessionId in: path description: The session identifier required: true schema: type: string format: uuid requestBody: description: '' content: application/json: schema: $ref: '#/components/schemas/AddCartItemRequest' responses: '201': description: Returns the identifier of the cart item content: application/json: schema: $ref: '#/components/schemas/AddCartItemResponse' '400': description: >- Some parameters are invalid or missing, check the response for more details content: application/json: schema: $ref: '#/components/schemas/ProblemDetails' '401': description: >- `X-API-KEY` header is invalid or does not give access to the operation content: application/json: schema: $ref: '#/components/schemas/ProblemDetails' '404': description: >- The session identifier does not match an active session. It may have expired content: application/json: schema: $ref: '#/components/schemas/ProblemDetails' components: schemas: AddCartItemRequest: required: - productId - quantity - amount type: object properties: productId: type: integer format: int32 quantity: type: integer format: int32 amount: type: object properties: amount: type: number description: decimal amount example: 99.99 currency: type: string description: Uppercase three-letter code from ISO 4217 example: EUR hidePrice: type: boolean nullable: true comment: type: string nullable: true sendTo: $ref: '#/components/schemas/SendToType' beneficiary: $ref: '#/components/schemas/BeneficiaryInfo' sentFrom: type: string nullable: true additionalProperties: false AddCartItemResponse: type: object properties: cartItemIds: type: array items: type: string format: uuid nullable: true additionalProperties: false ProblemDetails: type: object properties: type: type: string nullable: true title: type: string nullable: true status: type: integer format: int32 nullable: true detail: type: string nullable: true instance: type: string nullable: true additionalProperties: {} SendToType: enum: - Shopper - Beneficiary type: string description: >- Who receives the item. - `Shopper`: the item is sent to the person paying the order. - `Beneficiary`: the item is sent to a third party, whose details are then required in the `beneficiary` block. BeneficiaryInfo: type: object properties: firstName: type: string nullable: true lastName: type: string nullable: true email: type: string format: email nullable: true additionalProperties: false securitySchemes: ApiKey: type: apiKey description: API key delivered by D-EDGE name: X-API-KEY in: header ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.