After each transaction the value should be rounded up and the left over money should be paid automatically into a pot. For example if a coffee costs £2.50, £3 would leave the account, £2.50 to the merchant and 50p into a pot
After each transaction the value should be rounded up and the left over money should be paid automatically into a pot. For example if a coffee costs £2.50, £3 would leave the account, £2.50 to the merchant and 50p into a pot