Update README.md

README.md

@@ -17,6 +17,14 @@
 <a href="https://www.youtube.com/channel/UCrXM4HqK9th3E2a04Z9Lh-Q"><img src="https://img.shields.io/youtube/channel/subscribers/UCrXM4HqK9th3E2a04Z9Lh-Q?label=Subscribe&style=social" alt="Subscribe Youtube Channel"></a>
 </p>
 
+---
+<strong>
+Attention! You're currently using KPG-v1, which is outdated and no longer supported. It's scheduled to be removed in the future.
+  <br />
+Upgrade to KPG-v2 for a smoother checkout experience. 
+  <br />
+  You can find the KPG-v2 SDK for Flutter here: https://github.com/khalti/checkout-sdk-flutter
+</strong>
 ---
 
 Use Khalti Payment Gateway solution in your app or website to simplify payment for your customers. 
@@ -71,4 +79,4 @@ _**Contact Our Technical Team**_
 * Mobile (Viber / Whatsapp): 9843007232
 * Email / Skype: sashant@khalti.com
 
-(For payment gateway integration support.)
+(For payment gateway integration support.)