Online payment of Heritage membership. Baseline cost is $50 and any additional donation above $50 can be added via Increase Donation line. Increasing the Quantity will multiply the Baseline cost plus any additional donation by the Quantity number.
For instance, to get to a donation of $150, add an additional $100 donation. To get to a donation of $200, you can either add an additional donation of $150 or add an additional donation of $50 and increase Quantity to 2.