Why can’t I update my apps in the App Store

A Verified payment method is required to make use of the App Store.

It will not charge you for updating or downloading free apps, but it still requires the payment method be verified.

See here: Change or remove your Apple ID payment information - Apple Support

and here: If you can't choose None when you edit your Apple ID payment information - Apple Support

The $1.00 charge is an authorization hold used to verify the payment method works. Its generally reversed within a few days.

See here for details: About payment card authorization holds in the iTunes Store - Apple Support

When you update your billing information in the iTunes, iBooks, and App Store, or add a member to your Family Sharing group, a temporary authorization hold for a nominal amount is placed on your credit card or the payment method that you have on file. Like many other merchants, iTunes uses authorization holds to confirm that your payment account is active and has the funds available for purchases.

For example, in the United States, you might see a $1.00 USD authorization hold. If you live in another country or region, you might see a different amount in the currency of your region.

I tried to download a free app but when I put my card details in, it charged me $1.00 when it was free

I still facing the same problem