add validation in request

src/main/java/com/billpaymentservice/bbps/serviceImpl/ComplainServiceImpl.java

@@ -127,8 +127,8 @@ public class ComplainServiceImpl implements ComplainService {
 
 			Optional<TransactionMaster> dataById = transactionMasterRepository.findById(complainRequestDTO.getTxnId());
 			if (dataById == null || dataById.isEmpty()) {
-				LOGGER.warn("Txn Id is null");
-				throw new CustomException("Txn Id is required", "FAILED", BBPSConstant.BADREQUEST, null);
+				LOGGER.warn("Txn Data Not Found This Txn Id is null");
+				throw new CustomException(BBPSConstant.USER_Txn_IS_NOT_FOUND, "FAILED", BBPSConstant.BADREQUEST, null);
 			}
 
 			TransactionMaster transData = dataById.get();