What are the support systems for users of the software product?

Question

Helpdesk

A web-system is required: a user's personal account to manage a subscription to receive updates and technical support for a software product, then a service.
The system should include the following functionality on the client side:
1. User account with authorization elements - personal account.
2. Reflection in the user's account of the list of active services. Access to (files of) program updates.
3. Payment for inactive services on the site, or generation of an invoice for payment.
4. Ability to form user requests to the support service.
From the administrator's side:
1. Manage the services of all users, download payment data, to activate services. Binding to the serial number of the product.
2. HelpDesk system for working with user requests.
3. Notifying users about the approaching expiration of the service.
4. Division of rights between socialists supporting
Operational requirements. It is desirable that the system be a circulation system with a modular structure. Framework-based development is also acceptable, but it is also necessary that the basic functionality be as much as possible out of the box.
Tell me, maybe it’s not worth reinventing the wheel and there are ready-made systems of this type? If not, do you know the most suitable platform or developers?

Answer 1

Here is the TK (insufficient).
Decide.
Funny, honestly.
Yeah, the argument about advice goes by, they pay a lot of money for this.

Answer 2

You need to ask this not here, but on sites like freelancing, developers will run there, clarify the platform and write. for money.
there are no ready-made such systems, this is usually written for themselves and closed