sweetgreen for iOS - Order, pay, rewards. It's so clean, you can eat off it.
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Pay Finders - Discover and explore local merchants that accept Apple Pay
MightySignal Top SDKs - Most used SDKs in top 200 free iOS apps. Learn what to use.
Pay in apps with Venmo - Make purchases in apps using your Venmo account
bunq Apps - Create and market apps that work with bank accounts