Refactor payment service, fix DB session, and consolidate endpoints

- Fix critical NameError in database.py by restoring Session factory
- Refactor payment_service.py and crud.py to use shared constants.py and utils.py
- Deduplicate state mapping and input sanitization logic
- Move transaction amount calculation logic from CRUD to Router layer
- Enforce type safety in schemas using IntEnum for TransactionType/Status
- Move capture endpoint from transaction.py to payment.py (now /payments/capture)
- Update create_customer_profile signature for clarity

config.py

@@ -1,24 +1,55 @@
 import os
 
-def load_config(mode=os.environ.get('MODE')):
+# Authorize.net Configuration
+from authorizenet.constants import constants
 
+def load_config(mode=os.environ.get('MODE')):
+    """
+    Load the application configuration based on the environment mode.
+    Sets up Authorize.net environment variables on the config object.
+    """
+    config_class = None
+    
     try:
         if mode == 'PRODUCTION':
             from settings_prod import ApplicationConfig
-            return ApplicationConfig
+            config_class = ApplicationConfig
         
         elif mode == 'LOCAL':
             from settings_local import ApplicationConfig
-            return ApplicationConfig
+            config_class = ApplicationConfig
         
         elif mode == 'DEVELOPMENT':
-  
             from settings_dev import ApplicationConfig
-            return ApplicationConfig
+            config_class = ApplicationConfig
         else:
-            pass
+            # Default to dev if unknown mode
+            from settings_dev import ApplicationConfig
+            config_class = ApplicationConfig
 
     except ImportError:
-
+        # Fallback
         from settings_dev import ApplicationConfig
-        return ApplicationConfig
+        config_class = ApplicationConfig
+
+    # Set Authorize.net specific settings on the config class
+    if config_class.CURRENT_SETTINGS == 'PRODUCTION':
+        config_class.ENVIRONMENT = constants.PRODUCTION
+        config_class.VALIDATION_MODE = "liveMode"
+    elif config_class.CURRENT_SETTINGS == 'LOCAL':
+        config_class.ENVIRONMENT = constants.PRODUCTION
+        config_class.VALIDATION_MODE = "liveMode"
+    else:
+        config_class.ENVIRONMENT = constants.SANDBOX
+        config_class.VALIDATION_MODE = "testMode"
+        
+    return config_class
+
+# Load the configuration once
+ApplicationConfig = load_config()
+
+# Export variables for compatibility with imports in other files
+ENVIRONMENT = ApplicationConfig.ENVIRONMENT
+VALIDATION_MODE = ApplicationConfig.VALIDATION_MODE
+API_LOGIN_ID = ApplicationConfig.API_LOGIN_ID
+TRANSACTION_KEY = ApplicationConfig.TRANSACTION_KEY