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docs/zagros/order-trade-steps/order-api.md

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+# Order Creation: Api
+
+### Outcome:
+Users create sell or buy order.
+
+### Implementation description:
+
+#### Endpoints:
+- POST {$domain}/api/v2/peatio/marker/orders/fiat
+#### Params
+ - market
+ - side
+ - volume
+ - ord_type
+
+#### File destination:
+{$Dena_Path}/app/api/v2/market/orders.rb
+
+
+```mermaid
+sequenceDiagram
+
+    title Order Creation
+    User->>Ranj: market, side, volume, ord_type
+    Ranj->>Dena: POST: after client side checking
+    Dena->>Ranj: 4xx if lose any required parameters
+    Dena->>Ranj: 4xx if users level lower than the 
+    Dena->>Dena: compute lock balance
+    Dena->>Dena: send order to the Order Processor queue
+    Dena->>Ranj: 2xx order record created 
+
+    Ranj->>User: show The Order response
+
+```