upgraded to next 15 and react 19.

app/api/admin/merchants/[id]/offer-sync/route.ts

@@ -4,20 +4,22 @@ import { cookies } from 'next/headers';
 const API_BASE_URL = process.env.API_BASE_URL || process.env.NEXT_PUBLIC_API_BASE_URL;
 
 async function getAuthHeader() {
-  const token = cookies().get('session_token')?.value;
+  const cookieStore = await cookies();
+  const token = cookieStore.get('session_token')?.value;
   if (!token) throw new Error('Unauthorized');
   return { Authorization: `Bearer ${token}` };
 }
 
 export async function POST(
   request: NextRequest,
-  { params }: { params: { id: string } }
+  { params }: { params: Promise<{ id: string }> }
 ) {
   try {
+    const resolvedParams = await params;
     const headers = await getAuthHeader();
 
     const res = await fetch(
-      `${API_BASE_URL}/api/v1/admin/merchants/${params.id}/offer-sync`,
+      `${API_BASE_URL}/api/v1/admin/merchants/${resolvedParams.id}/offer-sync`,
       { method: 'POST', headers }
     );