i also agree with once a month pm,,, can you not also set up direct debit for evey month,,, oviously optional,,, just means that some of us can donate everymonth,, straight out the bank,, for others,, they can donate when they wish!
charities do this ,, you can donate evermonth,, were it be £2 or £20,, you set the limit,, they collect it!
just an idea