UserApp REST Services and Custom DAL entity

I'm using REST Services of UserApp and want to query for user
From the docs
I was able to successfully start using the service, I'm using querying
the service using following format:
identities/{Identity Id}/{attribute ID}

I see that REST Identities Service uses DAL to retrieve the user
Since we already defined a custom entity in DAL to represent our users,
how can I use this custom entity in REST Services instead of the default
'User' DAL entity?

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