It's said on website that person can get 0.65% bonus, is this bonus for everyone who own your card?
0.65% bonus will obtain every token holder. It is not necessary to have a Bonpay card, just to keep tokens.
How can I prove that the card and the wallet to which tokens are transferred belong to me?
You don't have to prove us your wallet address. Bonuses will be sent directly to the wallet, from which tokens were purchased and where they are kept.
Also he shouldn't keep token on the wallet exchangers to get 0.65 bonus. Do I get it right?
Usually if you participate in tokensale from exchange, you won't get your tokens, the same is with keeping them there, your bonuses will go to the exchange, not in your wallet.