This feature allows you to prepare special campaigns for limited number of affiliates, and hide those campaigns from the majority of your affiliates.
By default all campaigns are in Post Affiliate Pro public for all affiliates, and all affiliates can promote products from all campaigns.
Private campaigns allow you to define the visibility of your campaigns to your affiliates in multiple ways:
1. Public campaign - Visible to all affiliates
2. Public with manual approval - Affiliate has to request membership in the campaign. When the merchant approves, campaign details will be visible
3. Private - The merchant has to invite all affiliates, any they should have access to view campaign details