Payment Amount as Percentage of Another

Hello,

First off…so glad I found this plugin! I’ve been searching and searching for a simple free option to allow me to add some custom fields to a simple payment form. This is exactly what I needed!

I’m wondering if there is a way to make the payment amount a percentage of another or of the subtotal (for tax purposes for example). I’m required to charge sales tax. Another way this would be useful to me is to allow for discounts (I was hoping to have an item with a particular cost. If someone orders 2 or more, they’ll get 25% off). The tax would need to be calculated after the discount. Is this possible?

Thanks so much!