diff --git a/Controllers/PaymentController.cs b/Controllers/PaymentController.cs
index eac4284..f7e7a0a 100644
--- a/Controllers/PaymentController.cs
+++ b/Controllers/PaymentController.cs
@@ -34,7 +34,7 @@ namespace Idempotency.Controllers
         }
 
         [HttpPost]
-        [Idempotent]
+        [Idempotent(ExpireHours = 24)]
         public IActionResult Post([FromBody] PaymentRequest request)
         {
             if (request is null)