diff --git a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/controller/WebhookSendController.java b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/controller/WebhookSendController.java
index f338fbe..eaac82b 100644
--- a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/controller/WebhookSendController.java
+++ b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/controller/WebhookSendController.java
@@ -79,7 +79,7 @@ public class WebhookSendController {
         }
 
         // 2. 서명 검증
-        boolean isValid = webhookReceiveService.verifySignature(rawPayload, signature);
+        boolean isValid = webhookReceiveService.verifySignature(rawPayload, signature, "");
         if (!isValid) {
             log.warn("[Webhook] 수신 거부 - 서명 불일치 / eventType: {}", eventType);
             return ResponseEntity
diff --git a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookReceiveService.java b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookReceiveService.java
index b9943a7..e90aabf 100644
--- a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookReceiveService.java
+++ b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookReceiveService.java
@@ -20,7 +20,6 @@ public class WebhookReceiveService {
     private final ObjectMapper objectMapper;
 
     
-    private String secretKey = "HW8JtFpkPmQqsVmr0Rb81P4qDypaNIVbGf3ZNMMPfyerhOHshoKABLaMBo1HA4BldTxhw1NjYmVnoPu9IIV7cyRXjecL3b2UctyR7DnVaJausltZLLr8Qm4Bzs4wRmgf";
 
     private static final String HMAC_ALGORITHM  = "HmacSHA256";
     private static final long   TIMESTAMP_LIMIT = 5 * 60 * 1000L; // 5분 (ms)
@@ -33,14 +32,14 @@ public class WebhookReceiveService {
      * 수신된 서명과 payload 로 재계산한 서명을 비교
      * 헤더값 형식 : "sha256={hex값}"
      */
-    public boolean verifySignature(String rawPayload, String receivedSignature) {
+    public boolean verifySignature(String rawPayload, String receivedSignature, String secretKey) {
         try {
             // "sha256=" 접두어 제거
             String receivedHex = receivedSignature.startsWith("sha256=")
                     ? receivedSignature.substring(7)
                     : receivedSignature;
 
-            String expectedHex = generateSignature(rawPayload);
+            String expectedHex = generateSignature(rawPayload, secretKey);
 
             // 타이밍 공격 방지 : MessageDigest.isEqual 사용
             return MessageDigest.isEqual(
@@ -124,7 +123,7 @@ public class WebhookReceiveService {
     /*  공통 유틸                                                            */
     /* ------------------------------------------------------------------ */
 
-    private String generateSignature(String payload) throws Exception {
+    private String generateSignature(String payload, String secretKey) throws Exception {
         Mac mac = Mac.getInstance(HMAC_ALGORITHM);
         SecretKeySpec keySpec = new SecretKeySpec(
                 secretKey.getBytes(StandardCharsets.UTF_8), HMAC_ALGORITHM);
diff --git a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookService.java b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookService.java
index 34233c1..ef2472d 100644
--- a/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookService.java
+++ b/src/main/java/com/eactive/eai/rms/ext/djb/webhook/service/WebhookService.java
@@ -90,7 +90,14 @@ public class WebhookService {
                 wr.setData(new ArrayList<String>());
                 return wr;
             });
-            ((List<String>) resultMap.get(key).getData()).add(t.get(api.id.apiId));
+            
+            WebhookSendRequest wsr = resultMap.get(key);
+            if (wsr != null) {
+            	List<String> list = (List<String>) wsr.getData();
+            	if (list != null) {
+            		list.add(t.get(api.id.apiId));
+            	}
+            }
         }
 
         return new ArrayList<>(resultMap.values());