diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ffafd17
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,10 @@
+# dependencies
+/node_modules
+
+# IDE
+/.idea
+/.awcache
+/.vscode
+
+# misc
+npm-debug.log
\ No newline at end of file
diff --git a/apiLib/paytureCommon.js b/apiLib/paytureCommon.js
index 69762ac..94fba9c 100644
--- a/apiLib/paytureCommon.js
+++ b/apiLib/paytureCommon.js
@@ -61,7 +61,14 @@ exports.PaytureCommon = function PaytureCommon(){
     };
 
     this.toEncodeUrl = function toEncodeUrl(obj){
-        return querystring.stringify(obj, ';', '=');
+        var objectCopy = Object.assign(obj);
+        for (var key in objectCopy) {
+            if (objectCopy[key] === undefined) {
+                delete objectCopy[key];
+            }
+        }
+
+        return querystring.stringify(objectCopy, ';', '=');
     };
 
     this.COMMANDS = {