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

backend/test_mega_api.py

@@ -0,0 +1,44 @@
+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.mega_api import MegaMarketAPI
+from backend.mega_api.exceptions import MegaAPIError
+
+def test_mega_api():
+    # Load environment variables
+    env_path = os.path.join(os.path.dirname(__file__), '.env')
+    load_dotenv(env_path)
+    
+    # Check if key is loaded
+    api_token = os.getenv('MEGA_API_TOKEN')
+    
+    if not api_token:
+        print("Error: MEGA_API_TOKEN must be in backend/.env")
+        return
+        
+    print("Initializing MegaMarketAPI...")
+
+    api = MegaMarketAPI()
+    
+    try:
+        # Test 1: Get Orders
+        print("\n--- Testing Orders API ---")
+        orders_response = api.orders.get_new_orders(limit=5)
+        print("Success! Response keys:", orders_response.keys())
+        
+        # Usually wrapped in data
+        data = orders_response.get("data", {})
+        orders = data.get("orders", [])
+        print(f"Found {len(orders)} new orders.")
+            
+    except MegaAPIError as e:
+        print(f"API Error: {e}")
+    except Exception as e:
+        print(f"Unexpected Error: {e}")
+
+if __name__ == '__main__':
+    test_mega_api()