Recurly

Recurly is a fiercely pragmatic, deeply battle-tested titan that mathematically dominates the "Mid-Market SaaS Subscription Billing" space. It engineered a terrifyingly reliable recurring revenue engine. It is the absolute weapon of choice for fast-scaling B2B and B2C SaaS companies who mathematically demand a dedicated subscription billing platform with world-class dunning management that physically recovers millions in failed payment revenue that naive Stripe integrations completely miss.