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

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='1'
112	TestReqID	Free-form text string to be returned in resulting Heartbeat.	Y	String	E.g. UTC/Epoch Timestamp.

Tag

Field

Description

Req

Format

Notes

Standard FIX Header

Y

35='2'

7

BeginSeqNo

Message sequence number of first message in range to be resent.

Y

Int

-

16

EndSeqNo

Message sequence number of last message in range to be resent.

Y

Int

If request is for a single message BeginSeqNo (7) = EndSeqNo.

If request is for all messages subsequent to a particular message, EndSeqNo = "0" (representing infinity).

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='3'
45	RefSeqNum	FIX sequence number of the rejected message.	Y	SeqNum	-
58	Text	Human-friendly string providing reason for rejection.	Y	String	-

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='4'
23	GapFillFlag	-	Y	String	Always 'Y'.
36	NewSeqNo	The sequence number of the next message which will be transmitted by the sender	Y	SeqNum	-

Tag	Field	Description	Req	Format	Notes
	Standard FIX Header		Y		35='5'
58	Text	Human-friendly string providing reason for logout.	Y	String	-

=Infinity

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