Visa card disappeared from my Apple Wallet

The bank that issued the card can remove it. The card is automatically removed if you log out of your Apple Account (formerly known as Apple ID). Was the card actually in your Wallet app or was it in your Apple Account for use when purchasing games, apps, music, Apple services etc.?

When you try to add the card what error message do you receive?

Several banks in Belarus no longer support Apple Pay. I suspect he woke up and the card in his wallet said unavailable (thinking it disappeared) so he thought he’d fix it by removing the card and add it again. Now because the issuing bank no longer supports Apple Pay, it can’t be added to Wallet. Just my best guess. 😃😃

My understanding is the bank no longer supports Apple Pay.

Apple Pay participating banks in Africa, Europe, and the Middle East - Apple Support

Be clear in your question and the steps that you have performed. It makes no sense to post that "at some point it just disappeared", and then follow that up with "I removed the card from Apple Wallet in order to link it again, but nothing worked". You will never find a solution to a problem when you are not being up front on the issue you are having.

You asked the question "Why did the card disappear from Apple Wallet?", and then said you removed it. Nobody knows what you are talking about now.

Sorry, I’m confused. Your first post said it disappeared, the second post you said you removed it. What exactly is going on? What country are you in?

I too am now confused by your non-answer to:

“…. Your first post said it disappeared, the second post you said you removed it. What exactly is going on? … “

What bank issued the card you’re having issues with?