Quick easy and inexpensive way to add a donation button to woocommerce

I am doing a website for a non-profit for minimal cost. Everything I found out there for a donate button was complicated for a beginner, or too expensive to buy a annual renewal version.
This is free or $20 for one time paid, which is a good deal, especially for a non-profit.
I did have a small issue. They responded instantly and remedied my issue (on my end).