Warning! I\'m on a bit of a fishing trip here, and I\'m not even sure if the questions that I\'m asking entirely make sense. Please be kind with your responses! :)
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I have successfully build a custom user repository for OpenAm. Since this question have not been active for a while and because it would be too long to describe in details here how to do it, I will just give a few hints. If you need help on specifics, fell free to ask me.
From this point, your repository type will be listed among the other types when you create a data store for a realm.
Good luck !