shop? Do you mean the store? It changes as the item tiers unlock from level 0 thru VI. The Featured item rotates when yo buy it or every few days. The mystery Chests mostly stay the same.
On the events store it changes with each new set of missions. Once a week for the normal missions and once a week for the headhunter missions.
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On the events store it changes with each new set of missions. Once a week for the normal missions and once a week for the headhunter missions.