diff --git a/cotisations/models.py b/cotisations/models.py
index d314f31d..17d8cc2a 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -51,6 +51,8 @@ from re2o.field_permissions import FieldPermissionModelMixin
 from re2o.mixins import AclMixin, RevMixin
 from preferences.models import OptionalUser
 
+from cotisations.utils import find_payment_method
+
 
 # TODO : change facture to invoice
 class Facture(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
@@ -643,8 +645,9 @@ class Paiement(RevMixin, AclMixin, models.Model):
 
         :returns: An `HttpResponse`-like object.
         """
-        if hasattr(self, 'payment_method') and use_payment_method:
-            return self.payment_method.end_payment(invoice, request)
+        payment_method = find_payment_method(self)
+        if payment_method is not None and use_payment_method:
+            return payment_method.end_payment(invoice, request)
 
         # In case a cotisation was bought, inform the user, the
         # cotisation time has been extended too
diff --git a/cotisations/payment_methods/__init__.py b/cotisations/payment_methods/__init__.py
index 36904411..a85fa49c 100644
--- a/cotisations/payment_methods/__init__.py
+++ b/cotisations/payment_methods/__init__.py
@@ -1,25 +1,6 @@
-from django.conf.urls import include, url
-from django.utils.translation import ugettext_lazy as _l
-
-from . import comnpay, cheque
-
-
-urlpatterns = [
-    url(r'^comnpay/', include(comnpay.urls, namespace='comnpay')),
-    url(r'^cheque/', include(cheque.urls, namespace='cheque')),
-]
+from . import comnpay, cheque, urls
 
 PAYMENT_METHODS = [
     comnpay,
     cheque,
 ]
-
-
-def find_payment_method(payment):
-    for method in PAYMENT_METHODS:
-        try:
-            o = method.PaymentMethod.objects.get(payment=payment)
-            return o
-        except method.PaymentMethod.DoesNotExist:
-            pass
-    return None
diff --git a/cotisations/payment_methods/comnpay/models.py b/cotisations/payment_methods/comnpay/models.py
index 68f883d4..466f6d14 100644
--- a/cotisations/payment_methods/comnpay/models.py
+++ b/cotisations/payment_methods/comnpay/models.py
@@ -31,5 +31,5 @@ class ComnpayPayment(PaymentMethodMixin, models.Model):
     def end_payment(self, invoice, request):
         invoice.valid = False
         invoice.save()
-        content = comnpay(invoice, request)
+        content = comnpay(invoice, request, self)
         return render(request, 'cotisations/payment.html', content)
diff --git a/cotisations/payment_methods/comnpay/views.py b/cotisations/payment_methods/comnpay/views.py
index 094ebff4..85b237ff 100644
--- a/cotisations/payment_methods/comnpay/views.py
+++ b/cotisations/payment_methods/comnpay/views.py
@@ -114,7 +114,7 @@ def ipn(request):
     return HttpResponse("HTTP/1.0 200 OK")
 
 
-def comnpay(facture, request):
+def comnpay(facture, request, payment):
     """
     Build a request to start the negociation with Comnpay by using
     a facture id, the price and the secret transaction data stored in
@@ -122,14 +122,14 @@ def comnpay(facture, request):
     """
     host = request.get_host()
     p = Transaction(
-        str(AssoOption.get_cached_value('payment_id')),
-        str(AssoOption.get_cached_value('payment_pass')),
+        str(payment.payment_credential),
+        str(payment.payment_pass),
         'https://' + host + reverse(
-            'cotisations:comnpay_accept_payment',
+            'cotisations:comnpay:accept_payment',
             kwargs={'factureid': facture.id}
         ),
-        'https://' + host + reverse('cotisations:comnpay_refuse_payment'),
-        'https://' + host + reverse('cotisations:comnpay_ipn'),
+        'https://' + host + reverse('cotisations:comnpay:refuse_payment'),
+        'https://' + host + reverse('cotisations:comnpay:ipn'),
         "",
         "D"
     )
diff --git a/cotisations/payment_methods/forms.py b/cotisations/payment_methods/forms.py
index 2acc80f0..f5bf4f76 100644
--- a/cotisations/payment_methods/forms.py
+++ b/cotisations/payment_methods/forms.py
@@ -2,8 +2,8 @@ from django import forms
 from django.utils.translation import ugettext as _
 from django.utils.translation import ugettext_lazy as _l
 
-from . import PAYMENT_METHODS, find_payment_method
-
+from . import PAYMENT_METHODS
+from cotisations.utils import find_payment_method
 
 def payment_method_factory(payment, *args, **kwargs):
     payment_method = kwargs.pop('instance', find_payment_method(payment))
diff --git a/cotisations/payment_methods/urls.py b/cotisations/payment_methods/urls.py
new file mode 100644
index 00000000..9d35846f
--- /dev/null
+++ b/cotisations/payment_methods/urls.py
@@ -0,0 +1,7 @@
+from django.conf.urls import include, url
+from . import comnpay, cheque
+
+urlpatterns = [
+    url(r'^comnpay/', include(comnpay.urls, namespace='comnpay')),
+    url(r'^cheque/', include(cheque.urls, namespace='cheque')),
+]
diff --git a/cotisations/urls.py b/cotisations/urls.py
index 0603c96e..9e318b53 100644
--- a/cotisations/urls.py
+++ b/cotisations/urls.py
@@ -144,5 +144,5 @@ urlpatterns = [
         name='recharge'
     ),
     url(r'^$', views.index, name='index'),
-] + payment_methods.urlpatterns
+] + payment_methods.urls.urlpatterns
 
diff --git a/cotisations/utils.py b/cotisations/utils.py
new file mode 100644
index 00000000..01881af3
--- /dev/null
+++ b/cotisations/utils.py
@@ -0,0 +1,9 @@
+def find_payment_method(payment):
+    from cotisations.payment_methods import PAYMENT_METHODS
+    for method in PAYMENT_METHODS:
+        try:
+            o = method.PaymentMethod.objects.get(payment=payment)
+            return o
+        except method.PaymentMethod.DoesNotExist:
+            pass
+    return None