How do I get the new keycard in Fortnite?

Excuse me, I'm a bit confused about the process of obtaining the new keycard in Fortnite. Could you please walk me through the steps in detail? I'm not entirely sure where to start or what challenges I need to overcome to get my hands on this new item. Is there a specific mission or location that I need to visit? Additionally, are there any prerequisites or requirements that I need to fulfill before I can even attempt to acquire the keycard? Your guidance would be greatly appreciated.