We checked the Tomorrow integration for Outbank. 

Due to technical restrictions of Tomorrow there is no integration possible:
The Tomorrow Bank limits the refresh to only one device. So if we integrate Tomorrow in Outbank, you would be logged out of the Tomorrow Mobile Banking App with every account refresh in the Outbank App - and vise versa. This would just be complicated - which is not our goal.

Maybe Tomorrow changes its mind, if many customers submit the request there. It would be great, if you could open a feature request for a web interface or an open API (without PSD2), that Outbank could use for the integration.

Therefor you can open a chat from the website of Tomorrow: https://support.tomorrow.one/de/support/home or send an email to hello@tomorrow.one.  

Thank you for your support!