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The GET service will return all attributes you have access too, the options are the "GetPeopleService" and the "LimitedPeopleService", see the service contracts below for details. The LimitedPeopleService contains less attributes, but the more generic ones. Note: There is an enhancement request on-going that will An enhancement was deployed to Production in June 2019 to enable filtering on GetPeopleService click this link for details: PeopleService Version Notes 1.3
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