MakeTheDonation and Shift4.
Honest answer: we have not built a Shift4 integration yet. Here is where that stands.
Where things stand
We have asked about integrating with the Shift4 platform and we will build it when the platform opens to us.
When it lands, it will work the way MakeTheDonation always works: donations go directly from you to the nonprofit you pick, nonprofits never pay a fee, and you get one statement a month.
Sell on Shift4 and want this? Tell us - it helps make the case.