Hi Gijs,
thank you for your reply.
It seem that the GMI-Modul misses to pass the filter “transactions”.
https://api.getmyinvoices.com/accounts/v3/doc/#tag/Document/operation/Get%20one%20document
Before I checked every possible issue (Allowint to transact banking infos for example)
And the Modul don’t allows direct API-Calls…