Update install.mdx

Author: shalomgk

fern/docs/pages/sdks/web/install.mdx

@@ -73,3 +73,12 @@ Once the SDK is installed, the chat widget appears by default. If you are not us
     });
 </script>
 ```
+
+<Callout intent="note">
+To ensure seamless communication between the Web SDK and external services, you must configure your Content Security Policy (CSP) to allow access to specific domains.
+- https://api.devrev.ai
+- https://plug-platform.devrev.ai
+- https://ingestion-useast1.devrev.ai (For organizations in the US East region)
+- https://ingestion-eucentral1.devrev.ai (For organizations in the EU Central region)
+- https://ingestion-apsouth1.devrev.ai (For organizations in the AP South region)
+</Callout>