On a per donation basis, the minimum donation amount is HKD100, maximum is contingent on the Campaign target fundraise amount.
All Campaign raises are capped at a 20% overshoot, i.e. if a Campaign targets a raise of HKD10,000, the maximum raise allowed is HKD12,000, then the Campaign will be automatically completed successfully. Thus, in this case, the maximum donation is HKD12,000 minus whatever donations are already made to the said Campaign.