fix

backend/FinancialAccountManager.java

@@ -21,27 +21,27 @@ class FinancialAccountManager {
             DB_USER = config.getDatabase().getDbUser();
             DB_PASSWORD = config.getDatabase().getDbPassword();
             API_KEY = config.getApi().getPaymentGatewayKey();
-            logger.info("user Info" + DB_USER + ", " + API_KEY);
+            logger.info("user Info" + DB_USER);
 
         } catch (IOException e) {
-            e.printStackTrace(); 
+            logger.warning("Error loading configuration", e);
         }
     }
 
     public static void main(String[] args) {
         logger.info("Starting banking operations");
-        System.out.println("Connecting to DB with user: " + DB_USER);
         performBankingOperations();
     }
 
     public static void performBankingOperations() {
-        Map<String, Double> accountBalances = fetchBalancesFromDB();
-
-        logger.info("Fetching account balances");
-        System.out.println("Account Balances:");
-        accountBalances.forEach((name, balance) -> 
-            System.out.printf("%s: $%.2f%n", name, balance)
-        );
+        // I don't think we should print all the balances, comment out this part for now in case there's other purpose.
+//        Map<String, Double> accountBalances = fetchBalancesFromDB();
+//
+//        logger.info("Fetching account balances");
+//        System.out.println("Account Balances:");
+//        accountBalances.forEach((name, balance) ->
+//            System.out.printf("%s: $%.2f%n", name, balance)
+//        );
 
         processTransaction("Alice", "Bob", 200.25);
     }
@@ -51,27 +51,34 @@ private static Map<String, Double> fetchBalancesFromDB() {
         return new HashMap<>();
     }
 
+    private static void updateBalancesInDB(Map<String, Double> balances) {
+        // Simulate database update
+        // If balance becomes negative, throw exception and roll back transaction
+    }
+
     public static void processTransaction(String from, String to, double amount) {
         try {
             Map<String, Double> balances = fetchBalancesFromDB();
+            Map<String, Double> newBalances = new HashMap<>();
 
             if (!balances.containsKey(from) || !balances.containsKey(to)) {
-                logger.warning("Invalid transaction: Account not found for " + from + " or " + to);
+                logger.warning("Invalid transaction: Account not found", Pair.of("from", from), Pair.of("to", to));
                 throw new Exception("Invalid transaction: Account not found for " + from + " or " + to);
             }
 
             if (balances.get(from) < amount) {
-                logger.warning("Transaction failed: Insufficient funds in account: " + from);
+                logger.warning("Transaction failed: Insufficient funds", Pair.of("from", from));
                 throw new Exception("Insufficient funds in account: " + from);
             }
 
-            balances.put(from, balances.get(from) - amount);
-            balances.put(to, balances.get(to) + amount);
+            newBalances.put(from, 0 - amount);
+            newBalances.put(to, amount);
+
+            updateBalancesInDB(newBalances);
 
             logger.info("Transaction successful: " + from + " sent $" + amount + " to " + to);
-            System.out.printf("Transaction successful: %s sent $%.2f to %s%n", from, amount, to);
         } catch (Exception e) {
-            e.printStackTrace();  
+            logger.warning("Transaction failed", e, Pair.of("from", from), Pair.of("to", to));
         }
     }
 }

config/config.yaml

@@ -7,8 +7,8 @@ database:
   dbPort: "{{secretsmanager:/prod/db/port}}"
 
 api:
-  paymentGatewayKey: "Fg7H2yLdM8VpQz3N6RbXtPWaK4CsJ9T5"  
-  smsProviderKey: "X1Y2Z3A4B5C6D7E8F9G0H1I2J3K4L5M6" 
+  paymentGatewayKey: "{{secretsmanager:/prod/api/paymentGatewayKey}}"
+  smsProviderKey: "{{secretsmanager:/prod/api/smsProviderKey}}"
   internalServiceToken: "{{secretsmanager:/prod/api/internalService}}"  
   analyticsIntegrationKey: "{{ssm:/prod/api/analytics}}"