PayPal Holdings, Inc. is an American company operating a worldwide online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
Patreon is a membership platform that provides business tools for creators to run a subscription content service, as well as ways for artists to build relationships and provide exclusive experiences to their subscribers, or "patrons."
Stripe is a technology company. Its software allows individuals and businesses to receive payments over the Internet. Stripe provides the technical, fraud prevention, and banking infrastructure required to operate on-line payment systems.