You can use your physical card to make payments at physical point of sales (using payment terminals in shops), or online. You can make contactless payments up to 25 EUR per transaction.
If your mobile phone supports Google Pay or Apple Pay, you can add your card to the service. In order to do so, enter your Aion application, go to the "Finances" section on the main screen > click on the selected card > at the bottom of the screen select "Add to Apple Pay" or "Add to Google Pay".
You can also use the Google Pay or Apple wallet application downloaded from store or installed on your device.