Accounting program Uniconta
Integrating Uniconta you can automate your bookkeeping processes and posting of sales revenue and invoices.
Our partner 
developed a plug in that allow you to automatically transfer your subscription renewals from Billwerk+ Subscription Lite to your accounting system.
You choose at which invoice stage is transferred to the accounts, and you have many options for setting how the invoice is created in the accounts. It is also possible to post invoices automatically.If you have special needs for the transfer, most things can be solved with mappings and filters.
Read more here and contact IEX if you have any questions.