Have a look at MoneyMoney (via https://moneymoney-app.com), initially shared via https://together.bunq.com/topic/what-have-you-made-with-the-public-api#comment-2442.
The app has full bunq support (and supports an extensive array of German banks, too), and has pretty much all the features we needed for more comfortable business usage of our bunq accounts:
1.) Staged Transfers (called "Outbox") to batch send at a specific moment, not just right now
2.) Templated transfers for transferring to particular accounts or in case of specific amounts (like VAT and other taxes)
3.) Automatic downloading of account statements at monthly intervals
TL,DR: MoneyMoney puts us in a position where we can run multiple BVs (= LLCs) through one, beautifully designed, application. Highly recommended!