> ## 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. # Provides an ongoing promotion > Provides an ongoing promotion for a given session When no promotion is active for the session's hotel, the endpoint answers `204 No Content` with no body. Treat it as "no promotion", not as an error. ## OpenAPI ````yaml booking-engine-api/open-api/booking-engine-api.json GET /v2/{sessionId}/promotion openapi: 3.0.1 info: title: Booking Engine API version: v2 servers: - url: https://{apiBaseUrl} variables: apiBaseUrl: default: api.example.com description: Base URL delivered by D-EDGE during partnership setup security: [] tags: - name: Basket - name: Booking - name: Configuration - name: Description - name: Loyalty - name: Promotion - name: Resources - name: Search - name: Session paths: /v2/{sessionId}/promotion: get: tags: - Promotion summary: Provides an ongoing promotion for a given session. description: "Returns the latest active public promotion (offer code) applicable to\r\nthe session's hotel.\r\nReturns 204 No Content if no promotion is currently active." operationId: Promotion_GetOngoingPromotion parameters: - name: X-AVP-Impersonation in: header description: The session identifier. required: false schema: type: string - name: sessionId in: path required: true schema: type: string responses: '200': description: OK content: application/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Repositories.OfferCode.HubPlanningOfferCode examples: response: value: id: 00000000-0000-0000-0000-000000000000 hotelId: '10133' description: vfsoihfe isPublic: true isMobile: false isFlashSales: true displayCountdown: true endDate: '2026-06-08T00:00:00Z' discount: calculationMode: None percent: 0 nominal: amount: 0 currency: EUR text/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Repositories.OfferCode.HubPlanningOfferCode examples: response: value: id: 00000000-0000-0000-0000-000000000000 hotelId: '10133' description: vfsoihfe isPublic: true isMobile: false isFlashSales: true displayCountdown: true endDate: '2026-06-08T00:00:00Z' discount: calculationMode: None percent: 0 nominal: amount: 0 currency: EUR '204': description: No promotion is currently active for the session's hotel '400': description: The session code is invalid content: application/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Service.Examples.Session.InvalidSessionErrorResponse examples: response: value: code: InvalidHotelId text/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Service.Examples.Session.InvalidSessionErrorResponse examples: response: value: code: InvalidHotelId '401': description: >- Authentication header is invalid or does not give access to the operation content: application/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Service.Controllers.ErrorResponse_BookingEngine.Hub.Service.Config.SecurityErrorType_ text/json: schema: $ref: >- #/components/schemas/BookingEngine.Hub.Service.Controllers.ErrorResponse_BookingEngine.Hub.Service.Config.SecurityErrorType_ components: schemas: BookingEngine.Hub.Repositories.OfferCode.HubPlanningOfferCode: required: - id - hotelId - isPublic - isMobile - isFlashSales - displayCountdown - endDate type: object properties: id: $ref: '#/components/schemas/HotelBusiness.OfferCode.Common.OfferCodeId' hotelId: $ref: '#/components/schemas/Common.HubHotelId' code: type: string description: type: string isPublic: type: boolean isMobile: type: boolean isFlashSales: type: boolean displayCountdown: type: boolean endDate: format: date-time type: string discount: $ref: >- #/components/schemas/BookingEngine.Hub.Repositories.OfferCode.HubOfferCodeInfoDiscount BookingEngine.Hub.Service.Examples.Session.InvalidSessionErrorResponse: required: - code type: object properties: code: default: InvalidSessionId type: string message: type: string BookingEngine.Hub.Service.Controllers.ErrorResponse_BookingEngine.Hub.Service.Config.SecurityErrorType_: allOf: - $ref: >- #/components/schemas/BookingEngine.Hub.Service.Controllers.ErrorResponse - required: - code type: object properties: code: $ref: >- #/components/schemas/BookingEngine.Hub.Service.Config.SecurityErrorType HotelBusiness.OfferCode.Common.OfferCodeId: format: uuid type: string Common.HubHotelId: type: string BookingEngine.Hub.Repositories.OfferCode.HubOfferCodeInfoDiscount: required: - calculationMode - percent - nominal type: object properties: calculationMode: $ref: '#/components/schemas/Common.HubDiscountCalculationMode' percent: $ref: '#/components/schemas/HotelBusiness.Percent' nominal: $ref: '#/components/schemas/Library.Money' BookingEngine.Hub.Service.Controllers.ErrorResponse: type: object properties: message: type: string BookingEngine.Hub.Service.Config.SecurityErrorType: description: >- Category of security failure returned when authentication or authorization is rejected. enum: - InvalidUserAuthentication - InvalidUserRoles - InvalidPermissions type: string Common.HubDiscountCalculationMode: description: >- How a discount amount is computed against the base price. - **None** — No discount computation applies. - **PercentageWithoutExtras** — Percentage discount applied to the rate excluding extras. - **Percentage** — Percentage discount applied to the whole basket including extras. - **Nominal** — Flat monetary amount subtracted from the price. enum: - None - PercentageWithoutExtras - Percentage - Nominal type: string HotelBusiness.Percent: format: decimal type: number Library.Money: required: - amount - currency type: object properties: amount: format: decimal type: number currency: type: string ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.