I'm trying to implement oneAll in node.js, The nodejs sdk that you provided has the procedures for sharing message to social networks and getting the users list but i'm not sure how and which API should I call for registering the users.
to obtain a user_token / identity_token you need to either implement Social Login or Social Link in your website.
Please have a look here:
The user connects using his social network account. You receive the user_token / identity_token and you can the use these to post on behalf of the user.
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