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As their name says, they query the server for CampaignSelectionData and CampaignLeaderboardData. Before they have been called at least once, the GetSelectionCampaign* and GetCampaignLeaderboard* functions won't return anything.
Once they have been called, the EVENT_CAMPAIGN_SELECTION_DATA_CHANGED and EVENT_CAMPAIGN_LEADERBOARD_DATA_CHANGED will tell you that the data has been received.
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