A FIX client starts a FIX Drop Copy session by sending a Logon (A) message to TT FIX and ends the session by calling the Logout (5) message. While connected to a FIX Drop Copy session, a FIX client engages in a series of message conversations (requests and responses) with TT FIX to receive order and fills. Typically, market data message conversations involve the following request and response messages.

Common message flows

1. The drop copy message flow begins with TT FIX sending the FIX client the following order and fill messages:
   • Execution Report (8)
   • Order Cancel Reject (9)
   • Trade Capture Report (AE)
   (1A) If the Compliance Feed is enabled for the Drop Copy session in Setup, TT FIX also sends copies of order-routing requests.
   (1B) If the FIX client receives a Trade Capture Report (AE) message, it can optionally send a Trade Capture Report Ack (AR) message.
2. Because the primary purpose of a Drop Copy session is to listen for messages, it does not following the typical request/response paradigm. A FIX Drop Copy client needs to send a Heartbeat (0) message every 30 seconds to maintain its connection.
3. At any time, a FIX client can send an Order Status Request (H) message to request the status of an existing order.
4. TT FIX sends an Execution Report (8) message in response to the Order Status Request (H) message.