Auth0.Android: User Management

The Management API provides functionality that you can use to manage users of your application, including tasks such as the following.

Link separate user accounts from different providers, tying them to a single profile (See User Account Linking for details.)
Unlink user accounts, returning them to separate identities
Update user metadata

To get started, create a new UsersAPIClient instance by passing it the account and the token for the primary identity. In the case of linking users, this primary identity is the user profile that you want to "keep" the data for, and which you plan to link other identities to.

Auth0 account = new Auth0("YOUR_CLIENT_ID", "YOUR_DOMAIN");
UsersAPIClient users = new UsersAPIClient(account, "token");

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Linking user accounts will allow a user to authenticate from any of their accounts and no matter which one they use, still pull up the same profile upon login. Auth0 treats all of these accounts as separate profiles by default, so if you wish a user's accounts to refer to the same profile, you must perform account linking.

The link method accepts two parameters, the primary user id and the secondary user token (the token obtained after login with this identity). The user id in question is the unique identifier for this user account. If the id is in the format facebook|1234567890, the id required is the portion after the delimiting pipe.

users
    .link("primary user id", "secondary user token")
    .start(new BaseCallback<List<UserIdentity>, ManagementException>() {
        @Override
        public void onSuccess(List<UserIdentity> payload) {
            //Got the updated identities! Accounts linked.
        }

        @Override
        public void onFailure(ManagementException error) {
            //Error!
        }
    });

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Unlinking users is a similar process to the linking of users. The unlink method takes three parameters, though: the primary user id, the secondary user id, and the secondary provider (of the secondary user).

users
    .unlink("primary user id", "secondary user id", "secondary provider")
    .start(new BaseCallback<List<UserIdentity>, ManagementException>() {
        @Override
        public void onSuccess(List<UserIdentity> payload) {
            //Got the updated identities! Accounts linked.
        }

        @Override
        public void onFailure(ManagementException error) {
            //Error!
        }
    });

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When accounts are linked, the secondary account's metadata is not merged with the primary account's metadata. Similarly, when unlinking two accounts, the secondary account does not retain the primary account's metadata when it becomes separate again.

When updating user metadata, you will create a metadata object, and then call the updateMetadata method, passing it the user id and the metadata object. The values in this object will overwrite existing values with the same key, or add new ones for those that don't yet exist in the user metadata.

Map<String, Object> metadata = new HashMap<>();
metadata.put("name", Arrays.asList("My", "Name", "Is"));
metadata.put("phoneNumber", "1234567890");

users
    .updateMetadata("user id", metadata)
    .start(new BaseCallback<UserProfile, ManagementException>() {
        @Override
        public void onSuccess(UserProfile payload) {
            //Metadata updated
        }

        @Override
        public void onFailure(ManagementException error) {
            //Error!
        }
    });

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