> For the complete documentation index, see [llms.txt](https://developer.rategain.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.rategain.com/our-products/channel-manager/rg-bridge-supply-push/interface-specifications-reservation-notification-service.md).

# Interface Specifications – Reservation Notification Service

## Overview

**RG Bridge Services for PMS Integration** is a comprehensive suite of services available to RateGain partner organizations. These services facilitate the integration of Property Management Systems (PMS) with the Channel Manager.

**RateGain's Channel Manager**:

* A premier channel management system for distributing Availability, Rates, and Inventory (ARI) to Internet Booking Agents (OTAs) and collecting reservations from them.
* Trusted by some of the world’s most renowned hotels and hotel chains.

**Functionality**:

* **PMS to Channel Manager**: As availability and rates change in the PMS, updates are pushed to RezGain. RezGain processes these messages and pushes updates to the subscribed OTAs.
* **Reservations to PMS**: Reservations retrieved by the Channel Manager are sent to the PMS.

**Documentation Scope**:

* **Part 1**: Specifies the interface that RateGain's Channel Manager makes available to PMS to push ARI updates.
* **Part 2**: Details the interface that PMS needs to provide to the Channel Manager for pushing reservations and obtaining confirmation numbers.

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<figure><img src="/files/ONW3kKhrAw0x1MaVxiZE" alt=""><figcaption></figcaption></figure>


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