diff --git a/cotisations/migrations/0032_chequepayment_comnpaypayment.py b/cotisations/migrations/0032_chequepayment_comnpaypayment.py
new file mode 100644
index 00000000..76fc4ea0
--- /dev/null
+++ b/cotisations/migrations/0032_chequepayment_comnpaypayment.py
@@ -0,0 +1,59 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-06-28 17:28
+from __future__ import unicode_literals
+
+import cotisations.payment_methods.comnpay.aes_field
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def add_cheque(apps, schema_editor):
+    ChequePayment = apps.get_model('cotisations', 'ChequePayment')
+    Payment = apps.get_model('cotisations', 'Paiement')
+    for p in Payment.objects.filter(type_paiement=1):
+        cheque = ChequePayment()
+        cheque.payment = p
+        cheque.save()
+
+
+def add_comnpay(apps, schema_editor):
+    ComnpayPayment = apps.get_model('cotisations', 'ComnpayPayment')
+    Payment = apps.get_model('cotisations', 'Paiement')
+    AssoOption = apps.get_model('preferences', 'AssoOption')
+    options, _created = AssoOption.objects.get_or_create()
+    payment, _created = Payment.objects.get_or_create(
+        moyen='Rechargement en ligne'
+    )
+    comnpay = ComnpayPayment()
+    comnpay.payment_user = options.payment_id
+    comnpay.payment_pass = options.payment_pass
+    comnpay.payment = payment
+    comnpay.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0031_article_allow_self_subscription'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ChequePayment',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('payment', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='payment_method', to='cotisations.Paiement')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='ComnpayPayment',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('payment_user', models.CharField(blank=True, default='', max_length=255)),
+                ('payment_pass', cotisations.payment_methods.comnpay.aes_field.AESEncryptedField(blank=True, max_length=255, null=True)),
+                ('payment', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='payment_method', to='cotisations.Paiement')),
+            ],
+        ),
+        migrations.RunPython(add_cheque),
+        migrations.RunPython(add_comnpay),
+    ]
diff --git a/cotisations/migrations/0033_auto_20180628_2157.py b/cotisations/migrations/0033_auto_20180628_2157.py
new file mode 100644
index 00000000..51509105
--- /dev/null
+++ b/cotisations/migrations/0033_auto_20180628_2157.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-06-28 19:57
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0032_chequepayment_comnpaypayment'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='comnpaypayment',
+            name='payment_id',
+            field=models.CharField(blank=True, default='', max_length=255),
+        ),
+    ]
diff --git a/cotisations/models.py b/cotisations/models.py
index fe741d8f..d91aa6f1 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -42,6 +42,9 @@ from django.core.validators import MinValueValidator
 from django.utils import timezone
 from django.utils.translation import ugettext as _
 from django.utils.translation import ugettext_lazy as _l
+from django.urls import reverse
+from django.shortcuts import redirect
+from django.contrib import messages
 
 from machines.models import regen
 from re2o.field_permissions import FieldPermissionModelMixin
@@ -629,6 +632,36 @@ class Paiement(RevMixin, AclMixin, models.Model):
             )
         super(Paiement, self).save(*args, **kwargs)
 
+    def end_payment(self, invoice, request):
+        """
+        The general way of ending a payment. You may redefine this method for custom
+        payment methods. Must return a HttpResponse-like object.
+        """
+        if hasattr(self, 'payment_method'):
+            return self.payment_method.end_payment(invoice, request)
+
+        # In case a cotisation was bought, inform the user, the
+        # cotisation time has been extended too
+        if any(sell.type_cotisation for sell in invoice.vente_set.all()):
+            messages.success(
+                request,
+                _("The cotisation of %(member_name)s has been \
+                extended to %(end_date)s.") % {
+                    'member_name': request.user.pseudo,
+                    'end_date': request.user.end_adhesion()
+                }
+            )
+        # Else, only tell the invoice was created
+        else:
+            messages.success(
+                request,
+                _("The invoice has been created.")
+            )
+        return redirect(reverse(
+            'users:profil',
+            kwargs={'userid': request.user.pk}
+        ))
+
 
 class Cotisation(RevMixin, AclMixin, models.Model):
     """
diff --git a/cotisations/payment_methods/__init__.py b/cotisations/payment_methods/__init__.py
new file mode 100644
index 00000000..cc21f42b
--- /dev/null
+++ b/cotisations/payment_methods/__init__.py
@@ -0,0 +1,9 @@
+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/payment_methods/cheque/__init__.py b/cotisations/payment_methods/cheque/__init__.py
new file mode 100644
index 00000000..6610cdd8
--- /dev/null
+++ b/cotisations/payment_methods/cheque/__init__.py
@@ -0,0 +1,7 @@
+"""
+This module contains a method to pay online using cheque.
+"""
+from . import models, urls, views
+NAME = "CHEQUE"
+
+Payment = models.ChequePayment
diff --git a/cotisations/payment_methods/cheque/forms.py b/cotisations/payment_methods/cheque/forms.py
new file mode 100644
index 00000000..892ba190
--- /dev/null
+++ b/cotisations/payment_methods/cheque/forms.py
@@ -0,0 +1,10 @@
+from django import forms
+from django.utils.translation import ugettext_lazy as _l
+
+from cotisations.models import Banque as Bank
+
+
+class ChequeForm(forms.Form):
+    """A simple form to get the bank a the cheque number."""
+    bank = forms.ModelChoiceField(Bank.objects.all(), label=_l("Bank"))
+    number = forms.CharField(label=_l("Cheque number"))
diff --git a/cotisations/payment_methods/cheque/models.py b/cotisations/payment_methods/cheque/models.py
new file mode 100644
index 00000000..336f025e
--- /dev/null
+++ b/cotisations/payment_methods/cheque/models.py
@@ -0,0 +1,21 @@
+from django.db import models
+from django.shortcuts import redirect
+from django.urls import reverse
+
+from cotisations.models import Paiement as BasePayment
+
+
+class ChequePayment(models.Model):
+    """
+    The model allowing you to pay with a cheque. It redefines post_payment
+    method. See `cotisations.models.Paiement for further details.
+    """
+    payment = models.OneToOneField(BasePayment, related_name='payment_method')
+
+    def end_payment(self, invoice, request):
+        invoice.valid = False
+        invoice.save()
+        return redirect(reverse(
+            'cotisations:cheque:validate',
+            kwargs={'invoice_pk': invoice.pk}
+        ))
diff --git a/cotisations/payment_methods/cheque/urls.py b/cotisations/payment_methods/cheque/urls.py
new file mode 100644
index 00000000..f7cc39d5
--- /dev/null
+++ b/cotisations/payment_methods/cheque/urls.py
@@ -0,0 +1,10 @@
+from django.conf.urls import url
+from . import views
+
+urlpatterns = [
+    url(
+        r'^validate/(?P<invoice_pk>[0-9]+)$',
+        views.cheque,
+        name='validate'
+    )
+]
diff --git a/cotisations/payment_methods/cheque/views.py b/cotisations/payment_methods/cheque/views.py
new file mode 100644
index 00000000..ee858c9b
--- /dev/null
+++ b/cotisations/payment_methods/cheque/views.py
@@ -0,0 +1,45 @@
+"""Payment
+
+Here are defined some views dedicated to cheque payement.
+"""
+
+from django.urls import reverse
+from django.shortcuts import redirect, render, get_object_or_404
+from django.contrib.auth.decorators import login_required
+from django.contrib import messages
+from django.utils.translation import ugettext as _
+
+from cotisations.models import Facture as Invoice
+
+from .models import ChequePayment
+from .forms import ChequeForm
+
+
+@login_required
+def cheque(request, invoice_pk):
+    invoice = get_object_or_404(Invoice, pk=invoice_pk)
+    payment_method = getattr(invoice.paiement, 'payment_method', None)
+    if invoice.valid or not isinstance(payment_method, ChequePayment):
+        messages.error(
+            request,
+            _("You cannot pay this invoice with a cheque.")
+        )
+        return redirect(reverse(
+            'users:profil',
+            kwargs={'userid': request.user.pk}
+        ))
+    form = ChequeForm(request.POST or None)
+    if form.is_valid():
+        invoice.banque = form.cleaned_data['bank']
+        invoice.cheque = form.cleaned_data['number']
+        invoice.valid = True
+        invoice.save()
+        return redirect(reverse(
+            'users:profil',
+            kwargs={'userid': request.user.pk}
+        ))
+    return render(
+        request,
+        'cotisations/payment_form.html',
+        {'form': form}
+    )
diff --git a/cotisations/payment_methods/comnpay/__init__.py b/cotisations/payment_methods/comnpay/__init__.py
new file mode 100644
index 00000000..d0289364
--- /dev/null
+++ b/cotisations/payment_methods/comnpay/__init__.py
@@ -0,0 +1,6 @@
+"""
+This module contains a method to pay online using comnpay.
+"""
+from . import models, urls, views
+NAME = "COMNPAY"
+Payment = models.ComnpayPayment
diff --git a/cotisations/payment_methods/comnpay/aes_field.py b/cotisations/payment_methods/comnpay/aes_field.py
new file mode 100644
index 00000000..1329b0a7
--- /dev/null
+++ b/cotisations/payment_methods/comnpay/aes_field.py
@@ -0,0 +1,94 @@
+# coding:utf-8
+# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2017  Gabriel Détraz
+# Copyright © 2017  Goulven Kermarec
+# Copyright © 2017  Augustin Lemesle
+# Copyright © 2018  Maël Kervella
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# App de gestion des machines pour re2o
+# Gabriel Détraz, Augustin Lemesle
+# Gplv2
+"""preferences.aes_field
+Module defining a AESEncryptedField object that can be used in forms
+to handle the use of properly encrypting and decrypting AES keys
+"""
+
+import string
+import binascii
+from random import choice
+from Crypto.Cipher import AES
+
+from django.db import models
+from django.conf import settings
+
+EOD = '`%EofD%`'  # This should be something that will not occur in strings
+
+
+def genstring(length=16, chars=string.printable):
+    """ Generate a random string of length `length` and composed of
+    the characters in `chars` """
+    return ''.join([choice(chars) for i in range(length)])
+
+
+def encrypt(key, s):
+    """ AES Encrypt a secret `s` with the key `key` """
+    obj = AES.new(key)
+    datalength = len(s) + len(EOD)
+    if datalength < 16:
+        saltlength = 16 - datalength
+    else:
+        saltlength = 16 - datalength % 16
+    ss = ''.join([s, EOD, genstring(saltlength)])
+    return obj.encrypt(ss)
+
+
+def decrypt(key, s):
+    """ AES Decrypt a secret `s` with the key `key` """
+    obj = AES.new(key)
+    ss = obj.decrypt(s)
+    return ss.split(bytes(EOD, 'utf-8'))[0]
+
+
+class AESEncryptedField(models.CharField):
+    """ A Field that can be used in forms for adding the support
+    of AES ecnrypted fields """
+    def save_form_data(self, instance, data):
+        setattr(instance, self.name,
+                binascii.b2a_base64(encrypt(settings.AES_KEY, data)))
+
+    def to_python(self, value):
+        if value is None:
+            return None
+        return decrypt(settings.AES_KEY,
+                       binascii.a2b_base64(value)).decode('utf-8')
+
+    def from_db_value(self, value, *args, **kwargs):
+        if value is None:
+            return value
+        return decrypt(settings.AES_KEY,
+                       binascii.a2b_base64(value)).decode('utf-8')
+
+    def get_prep_value(self, value):
+        if value is None:
+            return value
+        return binascii.b2a_base64(encrypt(
+            settings.AES_KEY,
+            value
+        ))
diff --git a/cotisations/payment_utils/comnpay.py b/cotisations/payment_methods/comnpay/comnpay.py
similarity index 99%
rename from cotisations/payment_utils/comnpay.py
rename to cotisations/payment_methods/comnpay/comnpay.py
index 6c73463f..272ab928 100644
--- a/cotisations/payment_utils/comnpay.py
+++ b/cotisations/payment_methods/comnpay/comnpay.py
@@ -10,7 +10,7 @@ import hashlib
 from collections import OrderedDict
 
 
-class Payment():
+class Transaction():
     """ The class representing a transaction with all the functions
     used during the negociation
     """
diff --git a/cotisations/payment_methods/comnpay/models.py b/cotisations/payment_methods/comnpay/models.py
new file mode 100644
index 00000000..83a6f534
--- /dev/null
+++ b/cotisations/payment_methods/comnpay/models.py
@@ -0,0 +1,30 @@
+from django.db import models
+from django.shortcuts import render
+
+from cotisations.models import Paiement as BasePayment
+
+from .aes_field import AESEncryptedField
+from .views import comnpay
+
+
+class ComnpayPayment(models.Model):
+    """
+    The model allowing you to pay with COMNPAY. It redefines post_payment
+    method. See `cotisations.models.Paiement for further details.
+    """
+    payment = models.OneToOneField(BasePayment, related_name='payment_method')
+
+    payment_credential = models.CharField(
+        max_length=255,
+        default='',
+        blank=True
+    )
+    payment_pass = AESEncryptedField(
+        max_length=255,
+        null=True,
+        blank=True,
+    )
+
+    def end_payment(self, invoice, request):
+        content = comnpay(invoice, request)
+        return render(request, 'cotisations/payment.html', content)
diff --git a/cotisations/payment_methods/comnpay/urls.py b/cotisations/payment_methods/comnpay/urls.py
new file mode 100644
index 00000000..d7b1e293
--- /dev/null
+++ b/cotisations/payment_methods/comnpay/urls.py
@@ -0,0 +1,20 @@
+from django.conf.urls import url
+from . import views
+
+urlpatterns = [
+    url(
+        r'^accept/(?P<factureid>[0-9]+)$',
+        views.accept_payment,
+        name='accept_payment'
+    ),
+    url(
+        r'^refuse/$',
+        views.refuse_payment,
+        name='refuse_payment'
+    ),
+    url(
+        r'^ipn/$',
+        views.ipn,
+        name='ipn'
+    ),
+]
diff --git a/cotisations/payment.py b/cotisations/payment_methods/comnpay/views.py
similarity index 91%
rename from cotisations/payment.py
rename to cotisations/payment_methods/comnpay/views.py
index 4749bd05..094ebff4 100644
--- a/cotisations/payment.py
+++ b/cotisations/payment_methods/comnpay/views.py
@@ -15,8 +15,8 @@ from django.utils.translation import ugettext as _
 from django.http import HttpResponse, HttpResponseBadRequest
 
 from preferences.models import AssoOption
-from .models import Facture
-from .payment_utils.comnpay import Payment as ComnpayPayment
+from cotisations.models import Facture
+from .comnpay import Transaction
 
 
 @csrf_exempt
@@ -73,7 +73,7 @@ def ipn(request):
     Verify that we can firmly save the user's action and notify
     Comnpay with 400 response if not or with a 200 response if yes
     """
-    p = ComnpayPayment()
+    p = Transaction()
     order = ('idTpe', 'idTransaction', 'montant', 'result', 'sec', )
     try:
         data = OrderedDict([(f, request.POST[f]) for f in order])
@@ -121,15 +121,15 @@ def comnpay(facture, request):
     the preferences.
     """
     host = request.get_host()
-    p = ComnpayPayment(
+    p = Transaction(
         str(AssoOption.get_cached_value('payment_id')),
         str(AssoOption.get_cached_value('payment_pass')),
         'https://' + host + reverse(
-            'cotisations:accept_payment',
+            'cotisations:comnpay_accept_payment',
             kwargs={'factureid': facture.id}
         ),
-        'https://' + host + reverse('cotisations:refuse_payment'),
-        'https://' + host + reverse('cotisations:ipn'),
+        'https://' + host + reverse('cotisations:comnpay_refuse_payment'),
+        'https://' + host + reverse('cotisations:comnpay_ipn'),
         "",
         "D"
     )
@@ -145,9 +145,3 @@ def comnpay(facture, request):
     }
     return r
 
-
-# The payment systems supported by re2o
-PAYMENT_SYSTEM = {
-    'COMNPAY': comnpay,
-    'NONE': None
-}
diff --git a/cotisations/payment_utils/__init__.py b/cotisations/payment_utils/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/cotisations/templates/cotisations/payment_form.html b/cotisations/templates/cotisations/payment_form.html
new file mode 100644
index 00000000..1057b7cb
--- /dev/null
+++ b/cotisations/templates/cotisations/payment_form.html
@@ -0,0 +1,37 @@
+{% extends "cotisations/sidebar.html" %}
+{% comment %}
+Re2o est un logiciel d'administration développé initiallement au rezometz. Il
+se veut agnostique au réseau considéré, de manière à être installable en
+quelques clics.
+
+Copyright © 2018  Hugo Levy-Falk
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+{% endcomment %}
+
+{% load bootstrap3 %}
+{% load staticfiles%}
+{% load i18n %}
+
+{% block title %}{% trans form.title %}{% endblock %}
+
+{% block content %}
+    <h2>{% trans form.title %}</h2>
+    <form class="form" method="post">
+        {% csrf_token %}
+        {% bootstrap_form form %}
+        {% bootstrap_button tr_confirm button_type='submit' icon='piggy-bank' %}
+    </form>
+{% endblock %}
diff --git a/cotisations/urls.py b/cotisations/urls.py
index 6eafe721..0603c96e 100644
--- a/cotisations/urls.py
+++ b/cotisations/urls.py
@@ -29,7 +29,7 @@ from django.conf.urls import url
 
 import re2o
 from . import views
-from . import payment
+from . import payment_methods
 
 urlpatterns = [
     url(
@@ -143,20 +143,6 @@ urlpatterns = [
         views.recharge,
         name='recharge'
     ),
-    url(
-        r'^payment/accept/(?P<factureid>[0-9]+)$',
-        payment.accept_payment,
-        name='accept_payment'
-    ),
-    url(
-        r'^payment/refuse/$',
-        payment.refuse_payment,
-        name='refuse_payment'
-    ),
-    url(
-        r'^payment/ipn/$',
-        payment.ipn,
-        name='ipn'
-    ),
     url(r'^$', views.index, name='index'),
-]
+] + payment_methods.urlpatterns
+
diff --git a/cotisations/views.py b/cotisations/views.py
index 518df96b..47b716ce 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -73,7 +73,6 @@ from .forms import (
     CreditSoldeForm,
     RechargeForm
 )
-from . import payment as online_payment
 from .tex import render_invoice
 
 
@@ -159,11 +158,6 @@ def new_facture(request, user, userid):
                             'users:profil',
                             kwargs={'userid': userid}
                         ))
-            is_online_payment = new_invoice_instance.paiement == (
-                Paiement.objects.get_or_create(
-                    moyen='Rechargement en ligne')[0])
-            new_invoice_instance.valid = not is_online_payment
-            # Saving the invoice
             new_invoice_instance.save()
 
 
@@ -182,34 +176,8 @@ def new_facture(request, user, userid):
                     )
                     new_purchase.save()
 
-            if is_online_payment:
-                content = online_payment.PAYMENT_SYSTEM[
-                    AssoOption.get_cached_value('payment')
-                    ](new_invoice_instance, request)
-                return render(request, 'cotisations/payment.html', content)
+            return new_invoice_instance.paiement.end_payment(new_invoice_instance, request)
 
-            # In case a cotisation was bought, inform the user, the
-            # cotisation time has been extended too
-            if any(art_item.cleaned_data['article'].type_cotisation
-                   for art_item in articles if art_item.cleaned_data):
-                messages.success(
-                    request,
-                    _("The cotisation of %(member_name)s has been \
-                    extended to %(end_date)s.") % {
-                        'member_name': user.pseudo,
-                        'end_date': user.end_adhesion()
-                    }
-                )
-            # Else, only tell the invoice was created
-            else:
-                messages.success(
-                    request,
-                    _("The invoice has been created.")
-                )
-            return redirect(reverse(
-                'users:profil',
-                kwargs={'userid': userid}
-            ))
         messages.error(
             request,
             _("You need to choose at least one article.")
@@ -894,9 +862,9 @@ def recharge(request):
             number=1
         )
         purchase.save()
-        content = online_payment.PAYMENT_SYSTEM[
-            AssoOption.get_cached_value('payment')
-        ](invoice, request)
+        # content = online_payment.PAYMENT_SYSTEM[
+            # AssoOption.get_cached_value('payment')
+        # ](invoice, request)
         return render(request, 'cotisations/payment.html', content)
     return form({
         'rechargeform': refill_form,
diff --git a/users/views.py b/users/views.py
index fcb44f65..a125124c 100644
--- a/users/views.py
+++ b/users/views.py
@@ -882,7 +882,7 @@ def profil(request, users, **_kwargs):
         SortTable.USERS_INDEX_WHITE
     )
     user_solde = OptionalUser.get_cached_value('user_solde')
-    allow_online_payment = AssoOption.get_cached_value('payment') != 'NONE'
+    allow_online_payment = True# TODO : AssoOption.get_cached_value('payment') != 'NONE'
     return render(
         request,
         'users/profil.html',