feat: implement backend API clients for multi-marketplace integration and frontend service layer

backend/test_mm_api.py

@@ -0,0 +1,51 @@
+import os
+import sys
+from dotenv import load_dotenv
+
+# Add parent dir to path so we can import backend packages
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from backend.mm_api import MagnitMarketAPI
+from backend.mm_api.exceptions import MMAPIError
+
+def test_mm_api():
+    # Load environment variables
+    env_path = os.path.join(os.path.dirname(__file__), '.env')
+    load_dotenv(env_path)
+    
+    # Check if key is loaded
+    api_key = os.getenv('MM_API_KEY')
+    
+    if not api_key:
+        print("Error: MM_API_KEY must be in backend/.env")
+        return
+
+    print("Initializing MagnitMarketAPI...")
+    api = MagnitMarketAPI()
+    
+    try:
+        # Test 1: Get Unprocessed Orders
+        print("\n--- Testing Orders API (Unprocessed Orders) ---")
+        orders_response = api.orders.get_unprocessed_list(limit=5)
+        print("Success! Response keys:", orders_response.keys())
+        
+        orders = orders_response.get("orders", [])
+        print(f"Found {len(orders)} unprocessed FBS orders.")
+        
+        if orders:
+            order_id = orders[0].get("order_id")
+            print(f"First order - ID: {order_id}")
+            
+        # Test 2: Get Shipments
+        print("\n--- Testing Shipments API ---")
+        shipments_response = api.shipments.get_list()
+        shipments = shipments_response.get("shipments", [])
+        print(f"Found {len(shipments)} shipments.")
+            
+    except MMAPIError as e:
+        print(f"API Error: {e}")
+    except Exception as e:
+        print(f"Unexpected Error: {e}")
+
+if __name__ == '__main__':
+    test_mm_api()