How to organize finance accounting in redmine?

Question

Fintech

Share your experience, how someone keeps track of time, payments, finances in redmine,
I will describe my ideal scheme:
the client makes a request, possibly through the ticket system, perhaps I create the task myself, I issue an invoice, pays 50%, the task is set with a time estimate based on the amount paid, the problem is solved, payment of the second 50%.
And based on this, then see what tasks are completed in excess of the budget, which bills are not paid, the minimum accounting of finances.
Share your experience, plugins,
Thank you!

Answer 1

They poked, tried, installed a dozen of these systems, including redmine. Came to write my own.

Answer 2

For example, plugins from RedmineCRM:
Redmine Finance plugin
Invoices plugin