Fortunately, Warzone (in every capacity) is totally free to play across PlayStation, Xbox, and PC platforms  it's also a crossplay title, which has served to unite cross-platform players.

Free to Play for Everyone. Experience classic Call of Duty first-person combat in an all-new, massive arena for 150 players. Drop in, armor up, loot for rewards, and battle your way to the top. Welcome to Warzone.