# W (Market Data - Snapshot/Full refresh)

The FIX message **`W` (Market Data - Snapshot/Full Refresh)** provides a complete snapshot of the order book for [currency pairs](/docs/guides/exchange-fix-api/market-data-fix-api/supported-fix-messages/fix-application-level-messages/currency-pairs) according to the subscription type.

For simplicity, only full order book snapshots are transmitted; [**`X` (Market Data - Incremental Refresh)**](/docs/guides/exchange-fix-api/market-data-fix-api/supported-fix-messages/fix-application-level-messages/message-x-incremental-refresh) is not used to provide order book updates.

| Tag                              |           | Name            | Type              | Required                                                                    | Description                                                                                                                                                                                                                       |
| -------------------------------- | --------- | --------------- | ----------------- | --------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **262**                          |           | `MDReqID`       | `String`          | **yes, by Revolut FIX Gateway**                                             | Unique identifier of the subscription provided with the [**`V` (Market Data)**](/docs/guides/exchange-fix-api/market-data-fix-api/supported-fix-messages/fix-application-level-messages/message-v-market-data-request) request.   |
| **55**                           |           | `Symbol`        | `String`          | **yes**                                                                     | [Currency pair](/docs/guides/exchange-fix-api/market-data-fix-api/supported-fix-messages/fix-application-level-messages/currency-pairs).                                                                                          |
| **268**                          |           | `NoMDEntries`   | `NumInGroup`      | **yes**                                                                     | Number of the order book entries.                                                                                                                                                                                                 |
| ↳                                | **269**   | `MDEntryType`   | `Char`            | **yes**                                                                     | Type of the entry (bid or ask). <br/><br/>Supported values: <br/><ul><li> `0` - BID</li><li>`1` - ASK</li></ul>                                                                                                                   |
| ↳                                | **270**   | `MDEntryPx`     | `Price`           | **yes, by Revolut FIX Gateway**                                             | Price of the order book entry.                                                                                                                                                                                                    |
| ↳                                | **271**   | `MDEntrySize`   | `Qty`             | **yes, by Revolut FIX Gateway**                                             | Quantity of the order book entry.                                                                                                                                                                                                 |

For more details, see [`FIX 4.4 : Market Data - Snapshot/Full Refresh <W> message` in the FIX 4.4 documentation](https://www.onixs.biz/fix-dictionary/4.4/msgType_W_87.html).