diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index b63cea07..3ef9ce37 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -937,7 +937,7 @@ class BaseClasseCrans(CransLdap):
         # On dépasse la fin de sanction d'1min pour être sûr qu'elle est périmée.
         fin = fin + 60
             
-        new_c = '$'.join(map(str, new))
+        new_c = u'$'.join(map(unicode, new))
         new_c = preattr(new_c)[1]
         
         if index != -1:
@@ -3351,18 +3351,21 @@ class Facture(BaseClasseCrans):
             s += art['nombre'] * art['pu']
         return s
     
-    def urlPaypal(self):
+    def urlPaypal(self, useSandbox = False, businessMail = "paypal@crans.org"):
         """
         Retourne l'url paypal pour le paiement de cette facture
         """
-        url  = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart"
+        if useSandbox:
+            url  = "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_cart"
+        else:
+            url  = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart"
         url += "&upload=1"
-        url += "&business=paypal@crans.org"
+        url += "&business=%s" % businessMail
         url += "&currency_code=EUR"
         url += "&no_shipping=1"
         url += "&no_note=1"
-        url += "&return=http://factures.crans.org/return"
-        url += "&cancel_return=http://factures.crans.org/cancel"
+        url += "&return=http://factures.crans.org/nip.py"
+        url += "&cancel_return=http://factures.crans.org/nip.py"
         url += "&invoice="+self.numero() # num de facture
 
         item_id = 0