Download placement tags for publisher-paid campaigns
Publisher Portal is a platform for publishers to download tags for publisher-paid placements. This platform is just for publisher-paid placements: that's any placement where the publisher pays some or all of the ad serving costs. (Working with the advertiser, your site can agree to pay either all of the ad serving costs, or just the Studio uplift fees.) The other kind of placement is agency-paid, where the agency pays the costs.
Use Publisher Portal
Use the Publisher Portal to approve placements and download tags. You can't download tags for a placement until the placement is approved.