People in Sri Lanka keep lots of coins in every family for donate to temples for their worship. And if they can melt the coins, they get more money from the melted coins. So the government has to produce more coins but they don't have much budget for that. That's why the government ask to Buddhist temples to accept electric money such as debit cards for donation.
But I don't think Sri Lankan use such electronic cards in temples. They would keep their Buddhist tradition.