This is an accepted solution.
You are only able to filter on the properties linked in the documentation. You can filter by
since_id if you know what you are looking for. In other cases, if you get stuck with syntax we have all search syntax in our help docs here.
so it is not possible to get the desired result ( all balance transactions for a certain period) using the propertie processed_at?
Is there any way to get this data using the Rest api?