Page History

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• img / Image - if this is set to true then you should replace this item in your cache
• Orders - replace each order according to order id.
• Price point / full depth ladders
  • [1.2, 20] -> Insert / Update price 1.2 with size 20
    
  • [1.2, 0] -> Remove price 1.2 i.e. there is no size at this price
  • An empty list of points also means the ladder is now empty

Heartbeat / HearbeatMessage

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