You pool the transactions over a longer period. The donor initially gets charged $10, but if they cancel early they will get refunded. Then after a few months they get charged another $10 and so on.
It has drawbacks, like if the person doesn’t have $10 or they complain that they’re being charged. But a) is unlikely since most people who are that poor aren’t donating money, and b) is hopefully unlikely if you make it very clear how the payment system works and that they can get refunded if they cancel early.
It has drawbacks, like if the person doesn’t have $10 or they complain that they’re being charged. But a) is unlikely since most people who are that poor aren’t donating money, and b) is hopefully unlikely if you make it very clear how the payment system works and that they can get refunded if they cancel early.