AU credit card Credit cards may be issued to all of the university’s full-time staff (staff with a weekly number of hours of 18.5 or more), including PhD students who have a regular need for the use of such a card. The credit card can be used as a method of payment for official expenses during travel, for smaller purchases (expenses) on behalf of the university where electronic invoicing of suppliers is not possible, and for special purchases on the Internet.. You apply personally for a credit card by clicking on APPLY FOR A NEW CREDIT CARD. From here you click on the orange link in the upper right corner of the page. When you have filled in the information required, your application is automatically forwarded to the designated approver of the Department.