Hi adesh210,
Thanks for reaching out in Apple Support Communities. I understand you're having trouble downloading from the App Store due to a request for verification that keeps popping up after you've already verified. I can see why you'd reach out about this; I'd like to help. I'd recommend using these steps:
- Tap Settings > iTunes & App Store > Apple ID > View Apple ID > Manage Payments.
- Verify your payment and billing information here, then tap Save or Done.
- Open the App Store and attempt your purchase again.
If you continue to have trouble, I'd suggest logging in to the Manage your Apple ID website and verifying your payment info there. Restart your device after making any changes or updates, then try again.
Let me know what you find.
Best Regards.