From the doc: "GAIA-X itself does not act as a billing provider or clearing house. But GAIA-X will define standard interfaces and mechanisms for metering to be used by the Consumers and Providers. "

Yea.. so basically you have a catalogue but it's going to be up to the consumers or providers to find a way to stitch up a clearinghouse solution for dynamically orchestrated services from a multitude of providers. This is not only hard. It's near impossible. Without this crucial element, the platform is stillborn.