Re: The card is not added to the wallet.
"apple has marked this device as high-risk based on their own security policies,
which is something we don’t have control over.
please contact apple support, they will help you in this issue."
We are all Apple users like yourself, in the community, so Apple Support is unlikely tot see your post here.
To contact Apple Support:
There are "Get Support - start now" links (online chat / phone / email etc.)
at the bottom of their web-pages listed below.
For a card you want to use for Apple Pay: Apple Pay - Official Apple Support
For a card you want to use for purchases from Apple: Apple Account - Official Apple Support
For other Apple payment purposes: Subscriptions and Billing - Official Apple Support
or
Apple phone numbers around the world: Contact Apple Support - Apple Support