hi everyone
If anyone is intrested in placing a custom order for the development of custom plugin for the "Invoice manager" extension pls text here. With this plugin you can integrate Invoice manager with os property for automated invoicing and payment tracking. Quoted price by developer was around 500 euros, so if anyone intrested in such plugin we can share the costs.
you can have a look at the extension here:
demo.joomlathat.com/administrator/index.php
thanks