FIX - Session Management

All FIX messages must begin with header fields and end with a trailer field.

Tag#	Field Name	Required	Comments
8	BeginString	Yes	Identifies the beginning of message and protocol version. Always the first tag in the message. Valid value: FIX.4.4, FIXT.1.1 (FIX 5.0 SP2)
9	BodyLength	Yes	Message length, in bytes, forward to the CheckSum <10> field. Always second field in the message
35	MsgType	Yes	Defines message type. Always third field in message
49	SenderCompID	Yes	Identifies the sender of the message agreed between HashKey and the client
56	TargetCompID	Yes	Identifies the target of the message as agreed between HashKey and the client
34	MsqSeqNum	Yes	Message Sequence number. Handled by FIX engine. Indicates possible retransmission of message with this sequence number
43	PossDupFlag	No*	Indicates possible retransmission of message with this sequence number Required for re-transmitted message
97	PossResend	Yes	Indicates when message may be a duplicate of another message sent under a different sequence number
52	SendingTime	Yes	Time of the message transmission in UTC
122	OrigSendingTime	No*	Required for message sent as a result of ResendRequest (Expressed in UTC)

Tag	Field Name	Comments
10	string	Simple checksum. Always defined three characters in the last field in the message