Braintree - A full stack payment platform that helps merchants accept online and mobile payments (FT)

Chargify - Helps in managing business revenue and customer life cycle (FT)

Cheddar - Provides a full-featured, easy-to-use billing, and recurring subscription management system to accept and track one-time charges and recurring payments. (F) (FT)

Chargebee - Cloud based Subscription Billing Solution, providing elegant & comprehensive recurring billing solution for businesses worldwide.

Earthport - International payments services for banks and commercial organisations

Eway - An online payment gateway used by 13,000+ businesses to process credit card payments (FT)

Hiveage - Simple but powerful invoice and billing SaaS for SME’s (FT)

Pay Anywhere - Mobile credit card processing

Paycorp - Australian payment solutions company

PaymentWall - Payment platform connecting you to all payment platforms worldwide using a single API

Payoneer - Cross border billing platform. Includes escrow services and API's for marketplaces

PayPal (F)

Pin Payments- Australia’s first all-in-one online payment system (FT)

Recurly - Subscription billing automation and management (FT)

SecurionPay - Full featured, innovative payment system for European based businesses

Spreedly - Spreedly is a payments platform for (primarily) online commerce (FT)

Square - Sell on the go. Allows users to run business on an iPhone, iPad, or Android device

Stripe - A set of tools that instantly enable businesses to accept and manage online payments (FT)

Subscription Bridge - The recurring billing platform for all businesses (FT)