I got this. not sure ih applies to all. ymmv
The Gift URL link can be clicked to redeem a 7-day Pandora Premium gift pass. Open to US residents 18+; no purchase necessary. One time use. Current Pandora Plus and Pandora Premium subscribers are not eligible to redeem a gift pass via the Gift URL link. Additional limitations may apply to your offer based on additional factors or at Pandora's discretion. Pandora Premium is subject to the Pandora Subscription Terms available at www.pandora.com/legal/subscription
. Use of the gift pass constitutes acceptance of all applicable terms and conditions. If you have questions about this offer, you can contact User Support at help.pandora.com. Gift passes are issued by Pandora Media California, LLC. © 2018 Pandora Media California, LLC. All rights reserved.