In the past, subscription models were mainly known from the newspaper industry. In the last ten years, however, there has been a real Subscription boom Offered around digital services. Spotify, Netflix and Amazon Prime are leading the way. A key difference between these modern subscriptions can be seen in the flexibility and individuality of the offers. They are perfectly adapted to the Customer needs from today's world. Many of these services can be offered through a store system Usage-based, one-time or recurring purchase and can therefore be clearly distinguished from conventional subscriptions, which are based on long-term contractual commitments. The management of these billing models and the provision of different service package variants falls under the term Subscription Management.