Add customer management

internal_frontend/lib/api/serverCall.ts

@@ -0,0 +1,28 @@
+// lib/callBackendApi.ts
+import {getServerSession} from "next-auth";
+import {authOptions} from "@/lib/auth/authOptions";
+
+export async function serverCall(
+    path: string,
+    method: "GET" | "POST" | "PUT" | "DELETE" | "PATCH",
+    body?: unknown
+): Promise<Response> {
+    const url = `${process.env.INTERNAL_BACKEND_URL ?? "http://localhost:8080/api"}${path}`;
+    const session = await getServerSession(authOptions);
+
+    const headers: Record<string, string> = {
+        "Content-Type": "application/json",
+    };
+
+    if (session != null) {
+        headers["Authorization"] = `Bearer ${session.accessToken}`;
+    }
+
+    console.log("[api] Calling backend API: ", method, url, body);
+
+    return fetch(url, {
+        method,
+        headers,
+        body: body ? JSON.stringify(body) : undefined,
+    });
+}