docs: add documentation on sending requests to custom routes with JS SDK

www/apps/book/app/learn/fundamentals/admin/tips/page.mdx

@@ -126,6 +126,8 @@ export default ProductWidget
   </CodeTab>
 </CodeTabs>
 
+You can also send requests to custom routes as explained in the [JS SDK reference](!resources!/js-sdk).
+
 ---
 
 ## Routing Functionalities

www/apps/book/generated/edit-dates.mjs

@@ -50,7 +50,7 @@ export const generatedEditDates = {
   "app/learn/fundamentals/scheduled-jobs/execution-number/page.mdx": "2024-10-21T13:30:21.371Z",
   "app/learn/fundamentals/api-routes/parameters/page.mdx": "2024-11-19T16:37:47.251Z",
   "app/learn/fundamentals/api-routes/http-methods/page.mdx": "2024-10-21T13:30:21.367Z",
-  "app/learn/fundamentals/admin/tips/page.mdx": "2024-11-19T16:43:01.662Z",
+  "app/learn/fundamentals/admin/tips/page.mdx": "2024-12-12T11:43:26.003Z",
   "app/learn/fundamentals/api-routes/cors/page.mdx": "2024-12-09T13:04:04.357Z",
   "app/learn/fundamentals/admin/ui-routes/page.mdx": "2024-12-09T16:44:40.198Z",
   "app/learn/fundamentals/api-routes/middlewares/page.mdx": "2024-12-09T13:04:03.712Z",

www/apps/resources/app/js-sdk/page.mdx

@@ -290,6 +290,60 @@ The `Medusa` initializer accepts as a parameter an object with the following pro
 
 ---
 
+## Send Requests to Custom Routes
+
+The sidebar shows the different methods that you can use to send requests to Medusa's API routes.
+
+To send requests to custom routes, the JS SDK has a `client.fetch` method that wraps the [JavaScript Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch) that you can use. The method automatically appends configurations and headers, such as authentication headers, to your request.
+
+For example, to send a request to a custom route at `http://localhost:9000/custom`:
+
+<CodeTabs group="request-type">
+  <CodeTab label="GET" value="get">
+
+  ```ts
+  sdk.client.fetch(`/custom`)
+  .then((data) => {
+    console.log(data)
+  })
+  ```
+
+  </CodeTab>
+  <CodeTab label="POST" value="post">
+
+  ```ts
+  sdk.client.fetch(`/custom`, {
+    method: "post",
+    body: {
+      id: "123"
+    }
+  }).then((data) => {
+    console.log(data)
+  })
+  ```
+
+  </CodeTab>
+  <CodeTab label="DELETE" value="delete">
+
+  ```ts
+  sdk.client.fetch(`/custom`, {
+    method: "delete",
+  }).then(() => {
+    console.log("success")
+  })
+  ```
+
+  </CodeTab>
+</CodeTabs>
+
+The `fetch` method accepts as a first parameter the route's path relative to the `baseUrl` configuration you passed when you initialized the SDK.
+
+In the second parameter, you can pass an object of [request configurations](https://developer.mozilla.org/en-US/docs/Web/API/RequestInit). You don't need to configure the content-type to be JSON, or stringify the `body` or `query` value, as that's handled by the method.
+
+The method returns a Promise that, when resolved, has the data returned by the request. If the request returns a JSON object, it'll be automatically parsed to a JavaScript object and returned.
+
+---
+
 ## Medusa JS SDK Tips
 
 ### Use Tanstack (React) Query in Admin Customizations

www/apps/resources/generated/edit-dates.mjs

@@ -2248,7 +2248,7 @@ export const generatedEditDates = {
   "app/commerce-modules/store/links-to-other-modules/page.mdx": "2024-06-26T07:19:49.931Z",
   "app/examples/page.mdx": "2024-12-11T09:07:47.589Z",
   "app/medusa-cli/commands/build/page.mdx": "2024-11-11T11:00:49.665Z",
-  "app/js-sdk/page.mdx": "2024-10-16T12:12:34.512Z",
+  "app/js-sdk/page.mdx": "2024-12-12T11:41:51.152Z",
   "references/js_sdk/admin/Admin/properties/js_sdk.admin.Admin.apiKey/page.mdx": "2024-12-09T13:21:58.136Z",
   "references/js_sdk/admin/Admin/properties/js_sdk.admin.Admin.campaign/page.mdx": "2024-12-09T13:21:58.212Z",
   "references/js_sdk/admin/Admin/properties/js_sdk.admin.Admin.claim/page.mdx": "2024-12-09T13:21:57.972Z",