To activate your virtual credit card, open the app, go to Cards > Brazilian Card > Virtual card - Activate now, and follow the app’s validation instructions.
After validation, you can start using the virtual credit card and also add it to your Apple Pay and Google Wallet.
It’s important to note that the number of the virtual credit card is different from the plastic credit card. Therefore, you don’t need to wait for your plastic card to arrive to start using the virtual one.