diff --git a/eopayment/ogone.py b/eopayment/ogone.py
index 0872a34..e7c4569 100644
--- a/eopayment/ogone.py
+++ b/eopayment/ogone.py
@@ -6,7 +6,7 @@ from decimal import Decimal, ROUND_HALF_UP
 
 from common import (PaymentCommon, PaymentResponse, FORM, CANCELLED, PAID,
         ERROR, Form, DENIED, ACCEPTED, ORDERID_TRANSACTION_SEPARATOR,
-        ResponseError)
+        ResponseError, force_byte)
 def N_(message): return message
 
 ENVIRONMENT_TEST = 'TEST'
@@ -458,9 +458,10 @@ class Payment(PaymentCommon):
         values = params.items()
         values = [(a.upper(), b) for a, b in values]
         values = sorted(values)
-        values = ['%s=%s' % (a, b) for a, b in values if a in keep]
+        values = [u'%s=%s' % (a, b) for a, b in values if a in keep]
         tosign = key.join(values)
         tosign += key
+        tosign = force_byte(tosign)
         hashing = getattr(hashlib, algo)
         return hashing(tosign).hexdigest().upper()
 
@@ -513,10 +514,10 @@ class Payment(PaymentCommon):
             params['COM'] = description
         for key, value in kwargs.iteritems():
             params[key.upper()] = value
+        params['SHASIGN'] = self.sha_sign_in(params)
         # uniformize all values to UTF-8 string
         for key in params:
             params[key] = unicode(params[key]).encode('utf-8')
-        params['SHASIGN'] = self.sha_sign_in(params)
         url = self.get_request_url()
         form = Form(
                 url=url,
diff --git a/tests/test_ogone.py b/tests/test_ogone.py
index 5108223..ba7e8d7 100644
--- a/tests/test_ogone.py
+++ b/tests/test_ogone.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+
 from unittest import TestCase
 import urllib
 
@@ -5,13 +7,14 @@ import eopayment
 import eopayment.ogone as ogone
 from eopayment import ResponseError
 
-PSPID = '2352566'
+PSPID = u'2352566ö'
 
 BACKEND_PARAMS = {
     'environment': ogone.ENVIRONMENT_TEST,
     'pspid': PSPID,
-    'sha_in': 'secret',
-    'sha_out': 'secret'
+    'sha_in': u'sécret',
+    'sha_out': u'sécret',
+    'automatic_return_url': u'http://example.com/autömatic_réturn_url'
 }
 
 class OgoneTests(TestCase):
@@ -19,7 +22,7 @@ class OgoneTests(TestCase):
     def test_request(self):
         ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
         amount = '42.42'
-        order_id = 'myorder'
+        order_id = u'my ordér'
         reference, kind, what = ogone_backend.request(amount=amount,
                                         orderid=order_id, email='foo@example.com')
         self.assertEqual(len(reference), 30)
@@ -30,7 +33,7 @@ class OgoneTests(TestCase):
         self.assertEqual(root.attrib['method'], 'POST')
         self.assertEqual(root.attrib['action'], ogone.ENVIRONMENT_TEST_URL)
         values = {
-            'CURRENCY': 'EUR',
+            'CURRENCY': u'EUR',
             'ORDERID': reference,
             'PSPID': PSPID,
             'EMAIL': 'foo@example.com',