Donorhut - Donorhut offers cloud fundraising software for charities and non-profits of any size.
Giftbit Payment API - Stripe for gift cards
Txt2Give - Txt2Give helps churches, non-profits, schools, alumni associations, and political campaigns receive donations with text messages.
Wirize - Payment checkout for freelancers
Little Green Light - Illuminating Data. Advancing Nonprofits.
Payant for Messenger - Pay + get paid anywhere, including messaging apps