post https://api.getsilverfin.com/api/v4/f//companies//periods//export_file_instances
Export file instances are created based on a an export file through the
export_file_id.
They are created asynchronously, so when you create an export file
instance, you get back the id and the current state, which will be
pending on the first request.
You can then poll the detail page of an export file instance until the
state changes to created. When the state is created, you can fetch the
content.
Required scope(s): financials:write