Rewrite, edit and organize examples/rest demos.

examples/rest/authenticated/submit_order.py

@@ -0,0 +1,42 @@
+# python -c "import examples.rest.authenticated.submit_order"
+
+import os
+
+from bfxapi import Client, REST_HOST
+from bfxapi.enums import OrderType, Flag
+from bfxapi.rest.types import Notification, Order
+
+bfx = Client(
+    REST_HOST=REST_HOST,
+    API_KEY=os.getenv("BFX_API_KEY"),
+    API_SECRET=os.getenv("BFX_API_SECRET")
+)
+
+# Submit a new order
+submit_order_notification: Notification[Order] = bfx.rest.auth.submit_order(
+    type=OrderType.EXCHANGE_LIMIT,
+    symbol="tBTCUST", 
+    amount=0.015, 
+    price=10000, 
+    flags=Flag.HIDDEN + Flag.OCO + Flag.CLOSE
+)
+
+print("Submit order notification:", submit_order_notification)
+
+order: Order = submit_order_notification.notify_info
+
+# Update its amount and its price
+update_order_notification: Notification[Order] = bfx.rest.auth.update_order(
+    id=order.id,
+    amount=0.020, 
+    price=10150
+)
+
+print("Update order notification:", update_order_notification)
+
+# Cancel it by its ID
+cancel_order_notification: Notification[Order] = bfx.rest.auth.cancel_order(
+    id=order.id
+)
+
+print("Cancel order notification:", cancel_order_notification)