I am designing a donation form for a non-profit and I would like to add a field that would allow donors the chance to increase their giving by a % to cover the PayPal fees. I've seen this done on other sites, but I don't know if they use Gravity Forms.
What I would like is a form up so that the donor can say, "Yes/No I will increase my gift by 2.9% to cover the processing fees", and then that amount be calculated and added to their donation.
Is this possible? Can someone explain how to do this?
THANKS!
FYI: I have the PayPal plugin installed with Gravity Forms.