Even though you can use Travel Union App for daily transactions, a payment card will allow you to make purchases elsewhere. To do that, you have to order your card through the App.
Once you sign in and swipe to the right, where your card information and settings are stored, you will be able to order it by pressing "Order New Card". Choose your card's style and make sure your home address is provided correctly as it is going to be used for delivery.
Your PIN code will be available to view on your App once you activate the card.