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Listeners
Subscribe a listener to a betting market.
Apis.instance().db_api().exec( "subscribe_to_market", [updateListener, "1.3.0", "1.3.19"])
Parameters
updateListener: An object of type updateListener.1.3.0:Start version.1.3.19:End version.
Unsubscribe a listener from a betting market.
Apis.instance().db_api().exec( "unsubscribe_from_market", [updateListener, "1.3.0", "1.3.19"])
Parameters
updateListener: An object of type updateListener.1.3.0:Start version.1.3.19:End version.