Coin types of coins with which a user is permitted to pay for a transaction are divided into first and second groups. The coin types of the second group are of lower value than those of the first group. A difference in which a total amount of the transaction is a minuend is determined. Where the difference is positive and can only be exactly paid for by the user using just coins of the coin types of the second group, and where a community escrow has a current balance greater than the difference, the following is performed. In response to the user indicating that the difference should be paid for from the community escrow, the transaction is electronically credited from the community escrow by an amount equal to the difference, and the difference is electronically debited from the community escrow.