Square Invoices: Invoice Maker

Square Invoices is a strong match for the Stripe Payment Platform concept. It explicitly offers invoice and estimate creation, a secure and fast payment system, and supports various payment methods including credit/debit cards, Apple Pay, Google Pay, cash, check, and ACH. The app also features automatic reminders, real-time tracking and reporting, and flexible billing options like recurring invoices and deposits. While it doesn't emphasize developer APIs as heavily as Stripe, its core functionality aligns well with the payment processing and billing aspects of the concept. The mobile app management and reporting features are also clearly present.