I have found a ticket which talks about aggregating from multiple data sources to create a single claim [here](https://support.gluu.org/single-sign-on/3061/aggregatting-multiple-user-repos-to-build-claims-from-attributes-in-both/) which was helpful. However, our scenario is slightly different. We have different applications, each with their own SQL data store containing user information. In both of these data stores, users will have one common field. We want both of these applications to be able to login via Gluu but are unsure how to go about doing this. Our applications each currently have an authentication service which will authenticate users given a username / password. Is there a way we can have multiple custom scripts, of which only one would be called depending on the client? Or would we be better having an over-arching service, which would be responsible for this logic (deciding which authentication service to call)? Thanks in advance, Hannah