Changes to Summary of Sub-account's Margin Account (For Master Account)

for the query request parameter recvWindow, the format changed from no format to int64

for the query request parameter timestamp, the format changed from no format to int64

the response property code became required for the status 400

the response property code became required for the status 401

the response property msg became required for the status 400

the response property msg became required for the status 401

the response property subAccountList became required for the status 200

the response property subAccountList/items/email became required for the status 200

the response property subAccountList/items/totalAssetOfBtc became required for the status 200

the response property subAccountList/items/totalLiabilityOfBtc became required for the status 200

the response property subAccountList/items/totalNetAssetOfBtc became required for the status 200

the response property totalAssetOfBtc became required for the status 200

the response property totalLiabilityOfBtc became required for the status 200

the response property totalNetAssetOfBtc became required for the status 200