Leaving a Tip after someone paid for a digital product


is there any other way to make leaving a tip inside the cart page or inside the order confirmation page apart from using foxycart.io

I’m fluent in writing HTML/CSS but JS is only doable inside webflow for me so foxycart is hard to wrap my head around.

If there isn’t any other way, is there a place where I can hire someone to pontentially finish the task I’m looking to get finished?