What are the codes in War Robots?

I'm curious to know, could you elaborate on the codes in War Robots? Are these codes unique identifiers for each robot, or do they serve a different purpose within the game? Do players have to unlock these codes to access certain features or robots? If so, how do they go about acquiring them? And are there any restrictions or limitations to using these codes in the game? I'm interested in understanding the role these codes play in War Robots and how they impact the overall gameplay experience.