implemented quick pay within bank

src/validators/transfer.validator.js

@@ -0,0 +1,20 @@
+const transferValidator = async (req, res, next) => {
+  const { fromAccount, toAccount, toAccountType, amount } = req.body;
+
+  const accountTypes = ['SB', 'LN'];
+  if (!fromAccount || fromAccount.length != 11) {
+    return res.status(400).json({ error: 'INVALID_ACCOUNT_NUMBER_FORMAT' });
+  }
+  if (!toAccount || toAccount.length != 11) {
+    return res.status(400).json({ error: 'INVALID_ACCOUNT_NUMBER_FORMAT' });
+  }
+  if (!accountTypes || !accountTypes.includes(toAccountType)) {
+    return res.status(400).json({ error: 'INVALID_ACCOUNT_TYPE' });
+  }
+  if (!amount || amount <= 0) {
+    return res.status(400).json({ error: 'INVALID_AMOUNT' });
+  }
+  next();
+};
+
+module.exports = transferValidator;