diff --git a/readme.md b/readme.md
index cbba42f..7bdb28c 100644
--- a/readme.md
+++ b/readme.md
@@ -1,13 +1,14 @@
-Example NagadApi Payment Request
-Setting and attaching in your project you should run
-<pre>
-                composer require arif98741/nagad-api
-</pre>
+For using nagad-api in your application just follow below code.
+1. Copy all your data from .env.example to .env and change necessary details. 
+    NAGAD_APP_ENV                     = development  // dev: development, live: production
+    NAGAD_APP_LOG                     = 1 //it will generate error log
+    NAGAD_APP_ACCOUNT                 = //get from nagad. it is usually mobile no
+    NAGAD_APP_MERCHANTID              = //get from nagad
+    NAGAD_APP_MERCHANT_PRIVATE_KEY    = //get from nagad
+    NAGAD_APP_MERCHANT_PG_PUBLIC_KEY  = //get from nagad
+    NAGAD_APP_TIMEZONE                = Asia/Dhaka
 
 <pre>
-
-<?php
-
 use NagadApi\Base;
 use NagadApi\Helper;
 use NagadApi\RequestHandler;
@@ -16,14 +17,15 @@ require 'vendor/autoload.php';
 
 $nagad = new Base([
     'amount' => 100,
-    'invoice' => Helper::generateFakeInvoice('', 15, true),
+    'invoice' => Helper::generateFakeInvoice(15, true),
     'merchantCallback' => 'https://phpdark.com/payment/success/id=4',
 ]);
 
 $request = new RequestHandler($nagad);
-$respnose = $request->fire();
+
+$response = $request->fire();
 echo '<pre>';
-print_r($respnose);
+print_r($response);
 echo '</pre>';
 exit;
 </pre>
\ No newline at end of file