Ruling on giving zakaah by credit card

If someone earmarked part of his wealth as zakaah then it was stolen from him, does he have to give something else instead?

Giving zakaah to a poor person on the basis that it is a loan, for fear that he may waste the money on things that are not necessary

Zakaah on extra gold acquired during the [zakaah] year

Is it permissible for the poor person to appoint the one who is giving zakah to act as his deputy to accept it from himself on his behalf?

How can someone pay zakah who is owed money, does business and owes debts?

No zakaah is required on wealth that is given as a waqf to help people get married

Can he take back the zakaah of his wealth if he gave it to a poor person then found out that he did not need it?

His deputy gave the zakaah of his wealth in the form of foodstuff; is that acceptable or does he have to give it again?

He appointed his sister to distribute his zakaah but she refused to do it; does he have to give it again?