diff --git a/src/main/java/com/eactive/eai/adapter/service/DJBApiAdapterService.java b/src/main/java/com/eactive/eai/adapter/service/DJBApiAdapterService.java
index 8e27f86..2869011 100644
--- a/src/main/java/com/eactive/eai/adapter/service/DJBApiAdapterService.java
+++ b/src/main/java/com/eactive/eai/adapter/service/DJBApiAdapterService.java
@@ -74,8 +74,11 @@ public class DJBApiAdapterService extends HttpAdapterServiceSupport {
 	public static final String FINAL_STD_MESSAGE_KEY = "FINAL_STD_MESSAGE_KEY";
 	public static final String API_SERVICE_CODE = "API_SERVICE_CODE";
 	
-	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
-	
+	// 응답은 헤더그룹 처리를 위해 readTree() 로 파싱한 뒤 writeValueAsString() 으로 다시
+	// 문자열이 되므로, 이 왕복에서 숫자 자릿수가 유실되지 않는 mapper 를 써야 한다.
+	// 기본 ObjectMapper 는 100000000.00 을 1.0E8 로 바꿔버린다.
+	private static final ObjectMapper OBJECT_MAPPER = JacksonUtil.newNumberSafeMapper();
+
 	static Logger logger = Logger.getLogger(Logger.LOGGER_ADAPTER);
 	static Logger siftLogger = Logger.getLogger(Logger.LOGGER_SIFT);
 
@@ -87,7 +90,7 @@ public class DJBApiAdapterService extends HttpAdapterServiceSupport {
 
     public static final String PAYLOAD_PARAM_NAME_CLIENT_ID = "client_id";  // jwhong
 	
-    private ObjectMapper mapper = new ObjectMapper();
+    private ObjectMapper mapper = JacksonUtil.newNumberSafeMapper();
 	
     public String callApi(HttpServletRequest request, HttpServletResponse response, Properties httpProp,
 			AdapterGroupVO adapterGroupVO, AdapterVO adapterVO, Properties transactionProp) throws Exception {