​Workflow

1. Client submits order to Gemini exchange
2. Is the order accepted?
   • Yes, order is accepted
     1. Gemini sends an accepted order event
     2. Gemini sends zero or more initial fill events
     3. Does the order have non-zero remaining quantity?
        • Yes, the order has non-zero remaining quantity
          • Gemini sends a booked event
          • the order rests until
            • client sends a cancel request
              • Is the order cancelled?
                1. Yes, the order is cancelled
                   • Gemini sends a cancelled event followed by a closed event
                   • No further order events about this order
                2. No, the cancel request could not be fulfilled
                   • Gemini sends a cancel_rejected event explaining why the order cancel request could not be fulfilled.
                   • The order continues to rest on the books
            • a trade executes, partially or completely filling the order
              • Gemini sends a fill event with details about the trade, including remaining quantity
              • Is the order completely filled?

                1. Yes, the order is completely filled

                   • Gemini sends a closed event
                   • No further order events about this order

                2. No, the order has remaining quantity

                   • The order continues to rest on the books
        • No, the order has been completely filled
          • Gemini sends a closed event
          • No further order events about this order
   • No, order is rejected
     • Gemini responds with a rejected order event explaining why the order was rejected
     • No further order events about this order