Verification

Hello YashKing123,

Thanks for that info and for choosing the Apple Support Communities. If I understand correctly, you are unable to download a free app, as you get a prompt to check your billing. To help with this, please see if there is an issue with the payment method on your Apple ID, and possibly setup your Apple ID without any payment method, and here are some Apple resources to help with this:

Change, add, or remove Apple ID payment methods

Create or use an Apple ID without a payment method

Cheers!

If necessary, contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  

iTunes Support

iTunes Support – world wide