developers:fixapi:standardheader

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developers:fixapi:standardheader [2025/09/12 01:39] – removed - external edit (Unknown date) 127.0.0.1developers:fixapi:standardheader [2025/09/17 01:17] (current) – chad
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 +====== STANDARD HEADER ======
  
 +The Standard Header precedes all FIX messages and provides session identification, message routing, and sequencing information.
 +
 +===== Core Components =====
 +  * **Message Identity:** BeginString (8), MsgType (35), BodyLength (9)
 +  * **Session Identity:** SenderCompID (49), TargetCompID (56)
 +  * **Sequencing:** MsgSeqNum (34), SendingTime (52)
 +  * **Authentication:** SecureData (91), SecureDataLen (90) - Logon only
 +
 +===== Message Specification =====
 +
 +**Required in all messages**
 +
 +^ Tag ^ Field Name ^ Type ^ Req'd ^ Description ^
 +| 8 | BeginString | String | Y | Always "FIX.4.2" |
 +| 9 | BodyLength | Int | Y | Message length (excluding 8, 9, 10) |
 +| 35 | MsgType | String | Y | Message type identifier |
 +| 34 | MsgSeqNum | Int | Y | Message sequence number |
 +| 49 | SenderCompID | String | Y | Sender identifier |
 +| 56 | TargetCompID | String | Y | Target identifier |
 +| 52 | SendingTime | UTCTimestamp | Y | Message transmission time |
 +| 43 | PossDupFlag | Boolean | O | Y=Possible duplicate |
 +| 97 | PossResend | Boolean | O | Y=Possible resend |
 +| 50 | SenderSubID | String | C | Trader name (Multi-Trader mode) |
 +| 57 | TargetSubID | String | O | Target trader name |
 +| 122 | OrigSendingTime | UTCTimestamp | C | Original time (resends only) |
 +| 369 | LastMsgSeqNumProcessed | Int | O | Last received sequence |
 +| 90 | SecureDataLen | Int | C | License code length (Logon only) |
 +| 91 | SecureData | String | C | License code (Logon only) |
 +
 +===== Direction Rules =====
 +**Inbound (Client → T4):**
 +  * SenderCompID (49) = T4 Application Name
 +  * TargetCompID (56) = T4 Firm Name
 +
 +**Outbound (T4 → Client):**
 +  * SenderCompID (49) = T4 Firm Name
 +  * TargetCompID (56) = T4 Application Name
 +
 +===== Notes =====
 +  * First three tags must be: 8, 9, 35
 +  * Multi-Trader mode requires SenderSubID (50) for order messages
 +  * SecureData/SecureDataLen used only in Logon
 +  * Times in UTC format: YYYYMMDD-HH:MM:SS.sss