Implement a UPI QR payment flow with the Adyen payment gateway to support one-time and recurring payments using Payment Pages 2.0, real-time reconciliation, and callback handling.

1. Prepare for the integration .
2. Set up a Payment Page 2.0.
3. Configure Real-Time Reconciliation
4. Request a signature from Zuora for the payment page.
5. Set up your client code to integrate the payment page to your web page.
6. Implement the callback response.