From 7fd3ba0fc41ca14b05efdf743d69d561cfd53b8c Mon Sep 17 00:00:00 2001
From: Martin Berka <martin.berka@radbuza.net>
Date: Thu, 7 May 2026 14:07:36 +0200
Subject: [PATCH] =?UTF-8?q?fix:=20padding=20kontroln=C3=AD=20=C4=8D=C3=ADs?=
 =?UTF-8?q?lice=20IBAN?=
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---
 server/src/qr.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/server/src/qr.ts b/server/src/qr.ts
index 6327972..e848028 100644
--- a/server/src/qr.ts
+++ b/server/src/qr.ts
@@ -31,8 +31,8 @@ export function convertBbanToIban(bankAccountNumber: string): string {
     // Zatím napevno, nemá smysl řešit nic jiného než CZ
     iban = iban.replace('C', '12').replace('Z', '35');
     const remainder = BigInt(iban) % BigInt(97);
-    const checkDigits = BigInt(98) - remainder;
-    iban = `${COUNTRY_CODE}${checkDigits.toString()}${bankCode}${prefix}${accountNumber}`;
+    const checkDigits = (BigInt(98) - remainder).toString().padStart(2, '0');
+    iban = `${COUNTRY_CODE}${checkDigits}${bankCode}${prefix}${accountNumber}`;
     if (iban.length !== 24) {
         throw Error("Neplatná délka sestaveného IBAN: " + iban.length + ", očekáváno 24");
     }