Billwerk Self-service The only self-service platform for Billwerk clients Sign up Try our demo What is Billwerk Self-service? Billwerk self-service is a platform where end consumers can log in and manage their Billwerk purchased subscriptions at a specific merchant.We created this subscription management platform to help those of you that have a large base of subscribers, but no time to manage their plans. How it works? In a few simple steps you’ll have your self-service platform running and saving you countless hours of support time. Client Testimonials