Bill.com - Bill.com provides ACH payments processing, automates your accounts payable and accounts receivable processes.
sweetgreen for iOS - Order, pay, rewards. It's so clean, you can eat off it.
ChargeDesk - ChargeDesk offers billing support across most of the payment service providers.
Pay Finders - Discover and explore local merchants that accept Apple Pay
Zoho Invoice - 100% free online invoicing software for small businesses.
Pay in apps with Venmo - Make purchases in apps using your Venmo account