diff --git a/src/Apis/PaypageAPIConfig.php b/src/Apis/PaypageAPIConfig.php
index b25b2cab..b38a47e5 100644
--- a/src/Apis/PaypageAPIConfig.php
+++ b/src/Apis/PaypageAPIConfig.php
@@ -10,7 +10,7 @@
 class PaypageAPIConfig implements ApiConfig
 {
     private const DOMAIN = 'paypage.unzer.com';
-    private const TEST_DOMAIN = 'paypage.test.unzer.io';
+    private const TEST_DOMAIN = 'paypage.test.unzer.com';
     private const INT_DOMAIN = 'paypage.int.unzer.io';
 
     public static function getDomain(): string