@freewheelerbut I don't see them in my account information/activity
The Gift Card's should be visible in your Collection, see this post here.
https://www.istripper.com/forum/thread/46787/1?post=696853
When I want to buy a card do they show up then?
You can always show us some Screenshots from your side from the Screen,
so that we are be able to see what's going on on your Screen
😜Keep in mind to hide every personal Information.
Here you have some more Information.
https://www.istripper.com/forum/thread/46336/1
every time you buy a show, you will be proposed to buy it in credits or with your gift card!
Go to the Store, Click on a Card to Buy and you should see a Message.