The flow returns an authorisation token (consisting of 1740 characters) to the miniserver (via Loxberry MQTT to a Virtual Text Input). To my great surprise, this very large text token actually works in a Status Block plugged into a Virtual Output command. The HTTP reply for the Virtual Output is saved to the /user/common directory in the Miniserver. This local file is then polled for the desired values.
I could probably struggle to get more of the flow done in Node-Red (it seems similar to other authorisation processes such as Miele appliances). But the majority of the process can be executed within Loxone.
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