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MsgType (tag 35)	Message	Description
A	Logon	Initiates a FIX session. Heartbeat interval must be between 2 and 60, inclusive or the Logon attempt will be rejected.
0	Heartbeat	Monitors the status of the connection.
1	Test Request	Requests a Heartbeat from receiver.
2	Resend Request	Requests re-transmission of messages.
3	Reject	Session level message rejection.
4	Sequence Reset (Gap Fill)	Reset receiver’s sequence number.
5	Logout	Terminates a FIX session.

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='A'
108	HeartBtInt	Used to determine the heartbeat interval.	Y	Int	>=2 AND <=60 (Seconds)
554	Password	Password provided by MF	Y	String

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='0'
112	TestReqID	Conditionally populated if the Heartbeat is sent in response to a TestRequest.	C	String	Free-form text string as populated in the TestRequest. e.g. UTC/Epoch Timestamp

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