Hey Roy,
The data in the event is not configurable, but the event does pass along HQ credentials for the given FI in self.hq_credentials. Those credentials can then be used to pull the DBConfig from your extension using the WedgAddress DBObject for forms, or the VendorConfig DBObject for SSOs
I didn't completely understand what the marketplace referred to. I thought it was where a financial institution get partner apps from.
Since the marketplace is for end users and not financial institutions my question doesn't really make sense.
I just thought to put that out there in case other people have the same misconception.