diff --git a/eopayment/systempayv2.py b/eopayment/systempayv2.py
index d9153a4..66ea38e 100644
--- a/eopayment/systempayv2.py
+++ b/eopayment/systempayv2.py
@@ -117,20 +117,20 @@ PARAMETERS = [
                           'ONEY_SANDBOX, PAYPAL, PAYPAL_SB, PAYSAFECARD, '
                           'VISA')),
     # must be SINGLE or MULTI with parameters
-    Parameter('vads_payment_config', '', 07, default='SINGLE',
+    Parameter('vads_payment_config', '', 7, default='SINGLE',
               choices=('SINGLE', 'MULTI'), needed=True),
     Parameter('vads_return_mode', None, 48, default='GET',
               choices=('', 'NONE', 'POST', 'GET')),
     Parameter('signature', 'an', None, length=40),
-    Parameter('vads_site_id', 'n', 02, length=8, needed=True,
+    Parameter('vads_site_id', 'n', 2, length=8, needed=True,
               description=_(u'Identifiant de la boutique')),
     Parameter('vads_theme_config', 'ans', 32, max_length=255),
-    Parameter(VADS_TRANS_DATE, 'n', 04, length=14, needed=True,
+    Parameter(VADS_TRANS_DATE, 'n', 4, length=14, needed=True,
               default=isonow),
-    Parameter('vads_trans_id', 'n', 03, length=6, needed=True),
+    Parameter('vads_trans_id', 'n', 3, length=6, needed=True),
     Parameter('vads_validation_mode', 'n', 5, max_length=1, choices=('', 0, 1),
               default=''),
-    Parameter('vads_version', 'an', 01, default='V2', needed=True,
+    Parameter('vads_version', 'an', 1, default='V2', needed=True,
               choices=('V2',)),
     Parameter('vads_url_success', 'ans', 24, max_length=127),
     Parameter('vads_url_referral', 'ans', 26, max_length=127),