When you add a US bank account, PayPal will make two deposits for amounts between $0.01 and $0.99 USD to your bank account. You should see the deposits in your bank account in two to four business days.
To confirm your bank account, first find out the amounts of the two deposits. If you can view your card statement online, you can check for the amounts in a few days. Otherwise, you’ll need to wait for your next statement in the post.