The core activity of the company "doing GmbH" is the development and provision of individual communication solutions, particularly in the field of telecommunications and internet technologies. This includes, among other things: The conception and realization of solutions for computer telephony (CT); The development of mobile communication solutions; The provision of e-payment systems and payment systems for e-commerce; The implementation of secure solutions for payment processing; The provision of APIs for developers. The company also offers consulting and support services to support customers in selecting and implementing the right solutions.