Now you can not only sell products but also accept payment for services from your customers through your online store.
This CS-Cart Module allows you to issue invoices to customers and clients with a user-friendly interface. The administrator will always know, paid or not invoiced. When an account is created, the buyer will be seeing it in a special section. Convenient for those who besides the sale of goods, engaged in the provision of services.
To test the frontend, you have to make invoice for the particular user and login from him
1) Open page Orders - Invoices
2) Fill inputs and make an invoice
3) Now user see this invoice at the frontend
4) And he can pay for the invoice as for regular product