PayPal app Mercari apps won’t download
Why can’t I download my PayPal and Mercari apps?
iPhone 11, iOS 16
Why can’t I download my PayPal and Mercari apps?
iPhone 11, iOS 16
If you can't download, make purchases or update apps, including free apps, you need to update your payment method or add a new one. If you already verified that a payment method is available in your country or region and you're still having trouble, learn more.

Based on your country of residence and country you have selected under your Apple ID --> Payment methods that you can use with your Apple ID - Apple ...
Have you a Debit/Credit card that is issued to you that is valid internationally and is from the same Country / Region as your Apple ID.

Know it here --> If your payment method is declined in the App Store or iTunes ...
Check the following

Billing information is needed If you can't choose None as a payment method. The "None" option will not appear...
If you can't download, make purchases or update apps, including free apps, you need to update your payment method or add a new one. If you already verified that a payment method is available in your country or region and you're still having trouble, learn more.

Based on your country of residence and country you have selected under your Apple ID --> Payment methods that you can use with your Apple ID - Apple ...
Have you a Debit/Credit card that is issued to you that is valid internationally and is from the same Country / Region as your Apple ID.

Know it here --> If your payment method is declined in the App Store or iTunes ...
Check the following

Billing information is needed If you can't choose None as a payment method. The "None" option will not appear...
MissPeach65 Said:
"PayPal app Mercari apps won’t download: Why can’t I download my PayPal and Mercari apps?"
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Seems you may have a locked Apple ID...
Unlocking Your Locked Apple Account:
Overviewing your post, it appears that you are unable to access your Apple Account data, perhaps meaning that it has become locked. So, if that is the case, here is the information to use:
See if this Helps: If your Apple ID is Locked or Disabled - Apple Support
If that is of no success, then give Apple a Direct Call:
As you might suspect, no one here would know the reason for the occurrence, of course. So, contact Apple. They’ll know why this occurred and will run you right through how to fix.
Contacting Apple:
USA: 1(800)MY-APPLE
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For Note:
There are quite a few reasons as to why this may have occurred. Some possible reasons include:
PayPal app Mercari apps won’t download