# Requesting Specific Rates The EST transaction enables requests for specific rate types, such as negotiated, corporate, or standard rate plans. The most common use case of EST is to retrieve negotiated rates from the hotel CRS (Central Reservation System). This is achieved through RateGain's *Account Author* functionality, which facilitates the extraction of negotiated rates efficiently. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developer.rategain.com/our-products/smart-distribution/multiavailability-enhanced-shopping-transaction/enhanced-shopping-est-detailed-rate-information/requesting-specific-rates.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.