diff --git a/docs/how-to/backend/server-setup.mdx b/docs/how-to/backend/server-setup.mdx
index 8d303cb..e98106d 100644
--- a/docs/how-to/backend/server-setup.mdx
+++ b/docs/how-to/backend/server-setup.mdx
@@ -61,9 +61,46 @@ Let's setup everything you need to start communicating with a Fishjam instance.
 First of all, view your app in the [**Fishjam developer panel**](https://fishjam.io/app) and copy your **Fishjam ID** and the **Management Token**.  
 They are required to proceed. Now, we are ready to dive into the code.
 
+The verifying factory constructs the client and pings the Fishjam backend with the supplied credentials, so a bad `fishjamId` or `managementToken` fails at startup instead of on the first room operation.
+
 <Tabs groupId="language">
   <TabItem value="ts" label="Typescript">
-  
+
+    ```ts
+    process.env.FISHJAM_ID = "aaa";
+    process.env.FISHJAM_MANAGEMENT_TOKEN = "bbb";
+
+    // ---cut---
+    import { FishjamClient } from '@fishjam-cloud/js-server-sdk';
+
+    const fishjamClient = await FishjamClient.create({
+      fishjamId: process.env.FISHJAM_ID!,
+      managementToken: process.env.FISHJAM_MANAGEMENT_TOKEN!,
+    });
+    ```
+
+  </TabItem>
+
+  <TabItem value="python" label="Python">
+
+    ```python
+    import os
+    from fishjam import FishjamClient
+
+    fishjam_client = FishjamClient.create_and_verify(
+        fishjam_id=os.environ["FISHJAM_ID"],
+        management_token=os.environ["FISHJAM_MANAGEMENT_TOKEN"],
+    )
+    ```
+
+  </TabItem>
+</Tabs>
+
+If you need synchronous construction (for example inside a framework plugin that is not async), use the plain constructor and verify separately. The constructor only checks that the fields are non-empty; it does not contact the backend.
+
+<Tabs groupId="language">
+  <TabItem value="ts" label="Typescript">
+
     ```ts
     process.env.FISHJAM_ID = "aaa";
     process.env.FISHJAM_MANAGEMENT_TOKEN = "bbb";
@@ -71,10 +108,12 @@ They are required to proceed. Now, we are ready to dive into the code.
     // ---cut---
     import { FishjamClient } from '@fishjam-cloud/js-server-sdk';
 
-    const fishjamId = process.env.FISHJAM_ID;
-    const managementToken = process.env.FISHJAM_MANAGEMENT_TOKEN;
+    const fishjamClient = new FishjamClient({
+      fishjamId: process.env.FISHJAM_ID!,
+      managementToken: process.env.FISHJAM_MANAGEMENT_TOKEN!,
+    });
 
-    const fishjamClient = new FishjamClient({ fishjamId, managementToken });
+    await fishjamClient.checkCredentials();
     ```
 
   </TabItem>
@@ -85,10 +124,12 @@ They are required to proceed. Now, we are ready to dive into the code.
     import os
     from fishjam import FishjamClient
 
-    fishjam_id = os.environ["FISHJAM_ID"]
-    management_token = os.environ["FISHJAM_MANAGEMENT_TOKEN"]
+    fishjam_client = FishjamClient(
+        fishjam_id=os.environ["FISHJAM_ID"],
+        management_token=os.environ["FISHJAM_MANAGEMENT_TOKEN"],
+    )
 
-    fishjam_client = FishjamClient(fishjam_id, management_token)
+    fishjam_client.check_credentials()
     ```
 
   </TabItem>