Add docs for snap_getPreferences (#1681)

* Add docs for snap_getPreferences

* add what's new

* Update docs/whats-new.md

---------

Co-authored-by: Alexandra Carrillo <[email protected]>

Author: ziad-saab

docs/whats-new.md

@@ -17,6 +17,8 @@ of the [MetaMask developer page](https://metamask.io/developer/).
 - Updated [Wallet landing page](/wallet) and added [Connect to MetaMask](/wallet/connect) section
   with SDK, third-party libraries, and Wallet API connection options.
   ([#1494](https://github.com/MetaMask/metamask-docs/pull/1494))
+- Documented [`snap_getPreferences`](/snaps/reference/snaps-api/#snap_getpreferences).
+  ([#1681](https://github.com/MetaMask/metamask-docs/pull/1681))
 
 ## September 2024
 

snaps/features/localization.md

@@ -13,17 +13,17 @@ title and description) in the user's language.
 ### 1. Get the user's language
 
 In your Snap's code, determine the user's language by using the
-[`snap_getLocale`](../reference/snaps-api.md#snap_getlocale) API method.
-To call `snap_getLocale`, first request the required permission by adding it to the
+[`snap_getPreferences`](../reference/snaps-api.md#snap_getpreferences) API method.
+To call `snap_getPreferences`, first request the required permission by adding it to the
 `initialPermissions` field in your manifest file:
 
 ```json title="snap.manifest.json"
 "initialPermissions": {
-  "snap_getLocale": {}
+  "snap_getPreferences": {}
 }
 ```
 
-Your Snap can then call `snap_getLocale` to get the user's language code (for example, `en` or `es`).
+Your Snap can then call `snap_getPreferences` to get the user's language code (for example, `en` or `es`).
 
 ### 2. Localize the Snap's UI
 
@@ -65,7 +65,9 @@ export const locales = {
 export type Locale = keyof typeof locales
 
 export async function getMessage(id: keyof (typeof locales)[Locale]) {
-  const locale = (await snap.request({ method: "snap_getLocale" })) as Locale
+  const { locale } = (await snap.request({ method: "snap_getPreferences" })) as {
+    locale: Locale
+  }
   const { message } = locales[locale]?.[id] ?? locales[FALLBACK_LANGUAGE][id]
 
   return message
@@ -113,7 +115,7 @@ The following is an example of a localized manifest file:
     "locales": ["locales/da.json", "locales/en.json", "locales/nl.json"]
   },
   "initialPermissions": {
-    "snap_getLocale": {}
+    "snap_getPreferences": {}
   },
   "manifestVersion": "0.1"
 }

snaps/how-to/get-allowlisted.md

@@ -162,6 +162,7 @@ The following is a list of permissions that do not require allowlisting:
 - [`endowment:transaction-insight`](../reference/permissions.md#endowmenttransaction-insight)
 - [`snap_dialog`](../reference/snaps-api.md#snap_dialog)
 - [`snap_getLocale`](../reference/snaps-api.md#snap_getlocale)
+- [`snap_getPreferences`](../reference/snaps-api.md#snap_getpreferences)
 - [`snap_manageState`](../reference/snaps-api.md#snap_managestate)
 - [`snap_notify`](../reference/snaps-api.md#snap_notify)
 

snaps/reference/snaps-api.md

@@ -484,10 +484,15 @@ console.log(contents)
 </TabItem>
 </Tabs>
 
-## `snap_getLocale`
+## `snap_getLocale` (deprecated)
 
 Gets the user's locale setting. You can use this method to localize text in your snap.
 
+:::warning
+This method is deprecated.
+Use [`snap_getPreferences`](#snap_getpreferences) instead.
+:::
+
 #### Returns
 
 The user's locale setting as a [language code](https://github.com/MetaMask/metamask-extension/blob/develop/app/_locales/index.json).
@@ -545,6 +550,42 @@ await snap.request({
 </TabItem>
 </Tabs>
 
+## `snap_getPreferences`
+
+Gets the user's preferences.
+
+#### Returns
+
+An object containing the user's preferences:
+
+- `locale` - The user's locale setting as a language code.
+- `currency` - The user's preferred fiat currency code.
+
+#### Example
+
+```tsx title="index.tsx"
+import { Box, Text } from "@metamask/snaps-sdk/jsx";
+
+const { locale } = await snap.request({ method: "snap_getPreferences" });
+
+let greeting = "Hello";
+if(locale === "es") {
+  greeting = "Hola";
+}
+
+await snap.request({
+  method: "snap_dialog",
+  params: {
+    type: "alert",
+    content: (
+      <Box>
+        <Text>{greeting}</Text>
+      </Box>
+    ),
+  },
+});
+```
+
 ## `snap_manageAccounts`
 
 Manages [account management Snap](../features/custom-evm-accounts/index.md) accounts.