# Multiavailability (Enhanced Shopping Transaction)

This document aims to provide a comprehensive overview of the transactions and functionality available in the RateGain pull connectivity model. The primary component of this model is *UltraDirect*, and the APIs detailed in this documentation belong specifically to the XML UltraDirect framework. Key elements covered in this document include:

1. **Detailed Message Formats**
   * A thorough description of all fields (XML elements and attributes) utilized in the request and response messages.
   * This serves as a valuable resource for developers by complementing the XML message definitions provided in the HotelML XML Schema Definition (XSD) files.
2. **Message Examples**
   * Sample request and response messages showcasing the most critical functionalities.
3. **Typical Process/Transaction Flows**
   * An overview of standard workflows to guide implementation and integration.

A summary of the UltraDirect Enhanced Shopping Transactions API is provided below:

| Enhanced Shopping Transaction (EST) | Returns detailed information for each available room and rate for a set of properties identified by their property codes |
| ----------------------------------- | ------------------------------------------------------------------------------------------------------------------------ |


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