diff --git a/src/auth.js b/src/auth.js
new file mode 100644
index 0000000..620fed3
--- /dev/null
+++ b/src/auth.js
@@ -0,0 +1,7 @@
+const API_KEY = process.env.API_KEY;
+
+function fetchUserData(userId) {
+  return fetch(`https://api.example.com/users/${userId}`, {
+    headers: { "Authorization": `Bearer ${API_KEY}` }
+  });
+}