We have an endpoint that returns the sub aggregator access tokens for any connection that is established through Fuse - https://docs.letsfuse.com/reference/getfinancialconnection

So if our customers want to use another service or build it out themselves in house at a later date, they can always get all the original tokens.

We've also seen some of our customers use this endpoint to get access to original tokens and use it to make a request that we don't support yet via the original aggregator.