Question marked as
Looks like a payment error (?).
You may need to have a payment method on file, even if the app you want to download is free.
Check which payment method you have on file
See also -> Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
You can also use your Apple ID balance as payment method:
Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)
You can also contact the app developer -> How to contact an app developer – Apple Support (UK)