From 14a41312d6a508f4c15a5218370b9426f989ccea Mon Sep 17 00:00:00 2001
From: embr <git@liclac.eu>
Date: Thu, 9 Feb 2023 22:59:32 +0100
Subject: [PATCH] AfRApay.FTM: Use 16-byte idempotency keys

---
 AfRApay.FTM/Program.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/AfRApay.FTM/Program.cs b/AfRApay.FTM/Program.cs
index f02e866..9b8997e 100644
--- a/AfRApay.FTM/Program.cs
+++ b/AfRApay.FTM/Program.cs
@@ -149,7 +149,7 @@ static async void HandleTap(IIsoReader reader, HttpClient httpClient, TerminalSt
         case TerminalState.Debit:
         case TerminalState.Credit:
             var finalAmount = Math.Abs(amount) * (state == TerminalState.Debit ? -1 : 1);
-            var idempotencyKey = new byte[18];
+            var idempotencyKey = new byte[16];
             Random.Shared.NextBytes(idempotencyKey);
             var ik = Convert.ToHexString(idempotencyKey);
             await CallPut(httpClient, $"/api/card/{Convert.ToHexString(uid)}/transaction/{ik}?amount={finalAmount}");