diff --git a/Sources/TelemetryDeck/Signals/Signal.swift b/Sources/TelemetryDeck/Signals/Signal.swift
index 6727529..d95f6e1 100644
--- a/Sources/TelemetryDeck/Signals/Signal.swift
+++ b/Sources/TelemetryDeck/Signals/Signal.swift
@@ -407,7 +407,11 @@ extension DefaultSignalPayload {
         #if os(iOS) || os(tvOS)
         return UIApplication.shared.userInterfaceLayoutDirection == .leftToRight ? "leftToRight" : "rightToLeft"
         #elseif os(macOS)
-        return NSApp.userInterfaceLayoutDirection == .leftToRight ? "leftToRight" : "rightToLeft"
+        if let nsApp = NSApp {
+            return nsApp.userInterfaceLayoutDirection == .leftToRight ? "leftToRight" : "rightToLeft"
+        } else {
+            return "N/A"
+        }
         #else
         return "N/A"
         #endif
diff --git a/Sources/TelemetryDeck/Signals/SignalManager.swift b/Sources/TelemetryDeck/Signals/SignalManager.swift
index bf80dfa..20ff12b 100644
--- a/Sources/TelemetryDeck/Signals/SignalManager.swift
+++ b/Sources/TelemetryDeck/Signals/SignalManager.swift
@@ -231,7 +231,7 @@ private extension SignalManager {
                 self.configuration.logHandler?.log(.debug, message: messageString)
             }
 
-            let task = URLSession.shared.dataTask(with: urlRequest, completionHandler: completionHandler)
+            let task = self.configuration.urlSession.dataTask(with: urlRequest, completionHandler: completionHandler)
             task.resume()
         }
     }
diff --git a/Sources/TelemetryDeck/TelemetryClient.swift b/Sources/TelemetryDeck/TelemetryClient.swift
index cd0b052..c83389f 100644
--- a/Sources/TelemetryDeck/TelemetryClient.swift
+++ b/Sources/TelemetryDeck/TelemetryClient.swift
@@ -75,6 +75,13 @@ public final class TelemetryManagerConfiguration: @unchecked Sendable {
         }
     }
 
+    /// A customizable `URLSession` used for network requests within TelemetryDeck.
+    ///
+    /// This property allows you to override the default `URLSession.shared` for cases where
+    /// a custom session configuration is needed (e.g., for network interception, caching strategies,
+    /// or debugging). If not set, the `URLSession.shared` instance will be used.
+    public var urlSession: URLSession = URLSession.shared
+
     @available(*, deprecated, message: "Please use the testMode property instead")
     public var sendSignalsInDebugConfiguration: Bool = false