diff --git a/cbebirr/cbebirr.py b/cbebirr/cbebirr.py
index 7d22478..d50f91e 100644
--- a/cbebirr/cbebirr.py
+++ b/cbebirr/cbebirr.py
@@ -187,7 +187,7 @@ def cbebirrplus_payment(tillCode, amount, transactionId, transactionTime, compan
         "callBackURL": callBackURL
     }
 
-    sorted_payload = dict(OrderedDict(sorted(x.items())))
+    sorted_payload = dict(OrderedDict(sorted(payload.items())))
     signiture = sha256(urlencode(sorted_payload).encode('utf-8')).hexdigest()
     del payload['key']
     payload['signature'] = signiture
diff --git a/setup.py b/setup.py
index d4ade1b..a50ab61 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 with codecs.open(os.path.join(here, "README.md"), encoding="utf-8") as fh:
     long_description = "\n" + fh.read()
 
-VERSION = '0.0.12'
+VERSION = '0.0.13'
 DESCRIPTION = 'CBEBirr integration'
 LONG_DESCRIPTION = 'This package is a helper package with telebirr integration.'