App owners can assign any team member a supplementary card for their application without giving them access to sensitive information like its budget details.
To access the supplementary card that is assigned to you, you can go to the Applications tab and search for the application, and click the card icon under Payment method:
Alternatively, you can also click into the application, and under the Supplementary cards section, you will find the supplementary card you have access to and its expiry date.
To check the card details, click open the kebab dropdown, and click View details: