Tag#	Field Name	Required	Comments
Standard Header		Yes	MsgType <35> = x
320	SecurityReqID	Y	Unique ID for this request
559	SecurityListRequestType	Y	Type of Security Definition Request Valid values: 4 = All trading pairs
15	Currency	Y	List all the trading pairs by currency E.g. USD, HKD, USDT, USDC
Standard trailer

RAW
       8=FIX.4.4|9=81|35=x|49=JOSEPH|56=TradingGateway|34=56|52=20240609-02:19:48|320=123|559=4|15=HKD|10=245|

HEADER
       8                    BeginString: FIX 4.4
       9                     BodyLength: 81
      35                        MsgType: x (Security List Request)
      49                   SenderCompID: JOSEPH
      56                   TargetCompID: TradingGateway
      34                      MsgSeqNum: 56
      52                    SendingTime: 20240609-02:19:48

BODY
     320                  SecurityReqID: 123
     559        SecurityListRequestType: 4 (Request All Securities)
      15                       Currency: HKD

TRAILER
      10                       CheckSum: 245