Billing for web studios?

Question

Automation

Good afternoon, dear experts.
The task of automating financial payments in a web studio has appeared, the tasks of which are:
1. Website development
2. Support and hosting
3. Website moderation
4. Maintaining social. networks
, etc.
Products are different, in different price ranges.
I am looking for a product with the following features:
1. Formation of a list of common services (typical services) with a specific price
2. Formation of individual products (product + price + description)
3. Users in the system (clients and admins)
4. Integration of a payment system, such as LiqPay or other analogues, maybe just api to do it ...
Maybe someone did or saw this?

Answer 1

A web studio that asks for a ready-made billing solution for a web studio on a toaster is strong, yes.

Answer 2

Each web studio has its own bike.