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.
Invoice.to - A simple & beautiful invoice generator with Stripe & Paypal
Shopify Pay - Give shoppers a fast, secure way to pay
Free-Invoice.co.za - Free Invoice Software | Free online tool that helps small businesses to generate free invoices and manage their contact list. It can be used as an alternative to expensive invoicing software and online invoicing applications
Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS
Free Invoice Generator - A free invoice generator for startups