diff --git a/kfet/static/kfet/js/kfet.js b/kfet/static/kfet/js/kfet.js
index f2e207d2..f09bf347 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -38,7 +38,7 @@ function amountDisplay(amount, is_cof=false, tri='') {
 }
 
 function amountToUKF(amount, is_cof=false) {
-    var coef_cof = is_cof ? 1 + window.settings['subvention_cof'] / 100 : 1;
+    var coef_cof = is_cof ? 1 + Config.getAll().subvention_cof / 100 : 1;
     return Math.round(amount * coef_cof * 10);
 }
 
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index 1bda6045..9eb93643 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -169,6 +169,50 @@
 {% csrf_token %}
 
 <script type="text/javascript">
+
+function floatCheck(v) {
+    if (typeof v === 'number')
+        return v;
+    return Number.parseFloat(v);
+}
+
+class Config {
+
+    static getAll() {
+        if (typeof window.config === 'undefined')
+            window.config = {};
+        return window.config;
+    }
+
+    static reset(callback) {
+        $.ajax({
+            dataType: "json",
+            url     : "{% url 'kfet.kpsul.get_settings' %}",
+            method  : "POST",
+        })
+        .done(function(data) {
+            Config.addcost_for = data['addcost_for'];
+            Config.addcost_amount = data['addcost_amount'];
+            Config.subvention_cof = data['subvention_cof'];
+        })
+        .always(callback);
+    }
+
+    static set addcost_for(v) {
+        Config.getAll().addcost_for = v;
+    }
+
+    static set addcost_amount(v) {
+        Config.getAll().addcost_amount = floatCheck(v);
+    }
+
+    static set subvention_cof(v) {
+        Config.getAll().subvention_cof = floatCheck(v);
+    }
+
+}
+
+
 $(document).ready(function() {
     'use strict';
     // -----
@@ -178,25 +222,6 @@ $(document).ready(function() {
     // Lock to avoid multiple requests
     var lock = 0;
 
-    // Retrieve settings
-
-    window.settings = {}
-
-    function resetSettings() {
-        $.ajax({
-            dataType: "json",
-            url     : "{% url 'kfet.kpsul.get_settings' %}",
-            method  : "POST",
-        })
-        .done(function(data) {
-            window.settings['addcost_for'] = data['addcost_for'];
-            window.settings['addcost_amount'] = parseFloat(data['addcost_amount']);
-            window.settings['subvention_cof'] = parseFloat(data['subvention_cof']);
-            displayAddcost();
-        });
-    }
-
-
     // -----
     // Account data management
     // -----
@@ -815,12 +840,13 @@ $(document).ready(function() {
     var arrowKeys = /^(37|38|39|40)$/;
 
     function amountEuroPurchase(article_data, nb) {
+        var cfg = Config.getAll();
         var amount_euro = - article_data[3] * nb ;
-        if (settings['addcost_for'] && settings['addcost_amount'] && account_data['trigramme'] != settings['addcost_for'])
-            amount_euro -= settings['addcost_amount'] * nb;
+        if (cfg.addcost_for && cfg.addcost_amount && account_data['trigramme'] != cfg.addcost_for)
+            amount_euro -= cfg.addcost_amount * nb;
         var reduc_divisor = 1;
         if (account_data['is_cof'])
-            reduc_divisor = 1 + settings['subvention_cof'] / 100;
+            reduc_divisor = 1 + cfg.subvention_cof / 100;
         return amount_euro / reduc_divisor;
     }
 
@@ -1122,13 +1148,14 @@ $(document).ready(function() {
     var addcost_default_html = '<div id="addcost">Majoration vers <span class="addcost_for"></span> de <span class="addcost_amount"></span>€</div>';
 
     function displayAddcost() {
+        var cfg = Config.getAll();
         checkout_container.find('#addcost').remove();
         $('body').css('animation', 'none');
-        if (settings['addcost_for'] && settings['addcost_amount']) {
+        if (cfg.addcost_for && cfg.addcost_amount) {
             var addcost_html = $(addcost_default_html);
             addcost_html
-                .find('.addcost_for').text(settings['addcost_for']).end()
-                .find('.addcost_amount').text(settings['addcost_amount'].toFixed(2)).end();
+                .find('.addcost_for').text(cfg.addcost_for).end()
+                .find('.addcost_amount').text(cfg.addcost_amount.toFixed(2)).end();
             checkout_container.prepend(addcost_html);
             $('body').css('animation', 'colorchange 3s infinite');
         }
@@ -1258,8 +1285,8 @@ $(document).ready(function() {
                 .text(article['stock']);
         }
         if (data['addcost']) {
-            settings['addcost_for'] = data['addcost']['for'];
-            settings['addcost_amount'] = parseFloat(data['addcost']['amount']);
+            Config.addcost_for = data['addcost']['for'];
+            Config.addcost_amount = data['addcost']['amount'];
             displayAddcost();
         }
     }
@@ -1285,9 +1312,11 @@ $(document).ready(function() {
         resetArticles();
         resetPreviousOp();
         khistory.reset();
-        resetSettings();
-        getArticles();
-        getHistory();
+        Config.reset(function() {
+            displayAddcost();
+            getArticles();
+            getHistory();
+        });
     }
 
     function resetSelectable() {