Why my payment method keeps declining on free app

Hey King Sophie,

Thanks for the question. If I understand correctly, when you try to download or update, there is trouble with payment. I would recommend that you read this article, it may be able to help the issue.

Change or remove your Apple ID payment information in the iTunes Store - Apple Support

Use your Mac or PC

Click to open iTunes and sign in from the Account Information page, or use the steps below:

1. Open iTunes.
2. Click Sign In and enter your Apple ID.
   
3. Click your name and select Account Info from the drop-down menu. You'll be asked to sign in again.

   

Then use these steps to update your payment information:

1. From the Account Information page, click Edit to the right of Payment Type. You can see which payment methods the iTunes Store accepts in the Payment Type section. If you're using Family Sharing, only the family organizer can update the payment information. Learn more about payment information and Family Sharing.
   
2. Change or remove your information. To remove the payment method, select None.
   See what to do if you don't see None or can't select it.
   
3. Click Done.

After you change your payment information, the iTunes Store places a temporary authorization hold on your credit card to verify your updated account information.

Thanks for using Apple Support Communities.
Have a good one