The type of fee, such as ORDER, NETWORK, or SPREAD. ORDER - Fee for executing the order. NETWORK - Fee for network transactions. SPREAD - Fee for the difference between buy and sell prices. REBATE - Negative fee returned to the user as a reward or incentive.
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ORDER(value:'ORDER') -
NETWORK(value:'NETWORK') -
SPREAD(value:'SPREAD') -
REBATE(value:'REBATE')