diff --git a/WebContent/jsp/onl/apim/approval/portalAppApprovalManPopup.jsp b/WebContent/jsp/onl/apim/approval/portalAppApprovalManPopup.jsp
index 7d3e5bd..1803542 100644
--- a/WebContent/jsp/onl/apim/approval/portalAppApprovalManPopup.jsp
+++ b/WebContent/jsp/onl/apim/approval/portalAppApprovalManPopup.jsp
@@ -56,11 +56,16 @@
             $("#expectEndDate").datepicker().inputmask("yyyy-mm-dd", {'autoUnmask': true});
 
             $("#btn_app_approve").click(function () {
-                if (confirm("승인하시겠습니까?")) {
+                var isDeleteReq = (currentRequestType === 'DELETE');
+                var gwAction = (isDeleteReq && $('#chkGwDelete').is(':checked')) ? 'DELETE' : 'BLOCK';
+                var confirmMsg = isDeleteReq
+                    ? "해지 승인 시 포털 인증키(Credential)는 삭제되며,\n게이트웨이 클라이언트는 [" + (gwAction === 'DELETE' ? "완전 삭제" : "차단(비활성화)") + "] 처리됩니다.\n승인하시겠습니까?"
+                    : "승인하시겠습니까?";
+                if (confirm(confirmMsg)) {
                     $.ajax({
                         type: "POST",
                         url: url,
-                        data: {cmd: "APPROVE", id: key},
+                        data: {cmd: "APPROVE", id: key, gwAction: gwAction},
                         success: function (args) {
                             <%--alert("<%= localeMessage.getString("approval.approveSuccess") %>");--%>
                             alert("승인되었습니다.");
@@ -176,6 +181,8 @@
             });
         });
 
+        var currentRequestType = null; // 현재 신청 유형 (DELETE 승인 시 GW 처리방식 선택 노출용)
+
         function detail(key) {
             $.ajax({
                 type: "POST",
@@ -216,6 +223,21 @@
                         document.getElementById("btn_app_reject").style.display = "none";
                     }
 
+                    // API 이용해지(DELETE) 건: 승인 가능 상태의 현재 승인자에게만 GW 처리방식 선택 노출
+                    currentRequestType = data.requestType;
+                    var inProgress = data.approvalStatus.code === 'REQUESTED' || data.approvalStatus.code === 'PROCESSING';
+                    if (data.requestType === 'DELETE' && isCurrentApprover && inProgress) {
+                        $("#gwActionSection").show();
+                    } else {
+                        $("#gwActionSection").hide();
+                    }
+                    // 처리 완료된 해지 건은 어떤 방식으로 실행됐는지 표시
+                    if (data.requestType === 'DELETE' && data.gwAction) {
+                        $("#gwActionResult").text("GW 처리방식: " + (data.gwAction === 'DELETE' ? "완전 삭제" : "차단(비활성화)")).show();
+                    } else {
+                        $("#gwActionResult").hide();
+                    }
+
                     // 삭제된 승인자(USERID 없음)로 진행 불가한 건: 요청됨/진행중 상태면 승인자가 아니어도 강제 반려 허용
                     var hasDeletedApprover = data.approvers.some(approver =>
                         !approver.user || !approver.user.USERID
@@ -370,6 +392,13 @@
             </tbody>
         </table>
     </div>
+    <div id="gwActionSection" style="display:none; margin: 12px 0 0 4px; color: #c0392b;">
+        <label style="cursor:pointer;">
+            <input type="checkbox" id="chkGwDelete"/>
+            GW 인증정보 완전 삭제 (미체크 시 차단 처리 &mdash; 인증정보 보존, 복구 가능)
+        </label>
+    </div>
+    <div id="gwActionResult" style="display:none; margin: 12px 0 0 4px; font-weight: bold;"></div>
     <div class="popup_button">
     	<button type="button" class="cssbtn" id="btn_modify" level="W"><i
                 class="material-icons">save</i>수정
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManController.java b/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManController.java
index aec8c4a..5cde8ea 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManController.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManController.java
@@ -66,8 +66,8 @@ public class PortalApprovalManController extends BaseAnnotationController {
     }
 
     @PostMapping(value = "/onl/apim/approval/portalApprovalMan.json", params = "cmd=APPROVE")
-    public ResponseEntity<Void> approve(String id) {
-        portalApprovalManService.approve(id, SessionManager.getLoginVo().getUserId());
+    public ResponseEntity<Void> approve(String id, @RequestParam(required = false) String gwAction) {
+        portalApprovalManService.approve(id, SessionManager.getLoginVo().getUserId(), gwAction);
         return ResponseEntity.ok().build();
     }
 
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManService.java b/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManService.java
index 951ecac..c005c90 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManService.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/approval/PortalApprovalManService.java
@@ -2,6 +2,8 @@ package com.eactive.eai.rms.onl.apim.approval;
 
 import com.eactive.apim.portal.apispec.service.ApiSpecInfoService;
 import com.eactive.apim.portal.apprequest.entity.AppRequest;
+import com.eactive.apim.portal.apprequest.entity.AppRequestType;
+import com.eactive.apim.portal.apprequest.entity.GwAction;
 import com.eactive.apim.portal.apprequest.repository.AppRequestRepository;
 import com.eactive.apim.portal.approval.entity.Approval;
 import com.eactive.apim.portal.approval.entity.ApprovalType;
@@ -56,6 +58,7 @@ public class PortalApprovalManService extends BaseService {
     private static final String HARD_DELETE_FLAG_KEY = "approval.hard-delete.enabled";
 
     private final ApprovalService approvalService;
+    private final PortalApprovalUIMapper portalApprovalUIMapper;
     private final ApprovalStateMachine approvalStateMachine;
     private final AppRequestRepository appRequestRepository;
     private final PortalAppApprovalListener portalAppApprovalListener;
@@ -77,12 +80,18 @@ public class PortalApprovalManService extends BaseService {
     private EntityManager entityManager;
 
     public Page<PortalApprovalUI> selectList(Pageable pageable, PortalApprovalUISearch portalApprovalUISearch) {
+        // 목록 그리드는 Approval 자체 필드(제목/유형/상태/요청자/생성일/예상완료일)만 사용하므로
+        // 행별 상세 재조회(getDetailWithMaskOption: AppRequest + API 목록 + AGW 크로스 조회) 없이 경량 매핑한다.
         Page<Approval> approval = approvalService.findAll(pageable, portalApprovalUISearch);
         return approval.map(entity -> {
             try {
-                return getDetailWithMaskOption(entity.getId(), false);
+                PortalApprovalUI ui = portalApprovalUIMapper.toVo(entity);
+                if (ui.getRequester() == null) {
+                    ui.setRequester(createDeletedUserPlaceholder());
+                }
+                return ui;
             } catch (Exception e) {
-                logger.error("승인 상세 조회 실패 - ID: {}, 오류: {}", entity.getId(), e.getMessage());
+                logger.error("승인 목록 매핑 실패 - ID: {}, 오류: {}", entity.getId(), e.getMessage());
                 return null;
             }
         });
@@ -204,6 +213,7 @@ public class PortalApprovalManService extends BaseService {
             if (optRequest.isPresent()) {
                 AppRequest appRequest = optRequest.get();
                 appApprovalUI.setRequestType(appRequest.getType());
+                appApprovalUI.setGwAction(appRequest.getGwAction());
 
 
                 if (appRequest.getApiGroupList() == null || appRequest.getApiGroupList().isEmpty()) {
@@ -321,7 +331,7 @@ public class PortalApprovalManService extends BaseService {
         return placeholder;
     }
 
-    public void approve(String id, String approverId) {
+    public void approve(String id, String approverId, String gwAction) {
         Map options = new HashMap<>();
 
         Approval approval = approvalService.findById(id).orElseThrow(() -> new IllegalArgumentException("승인 정보를 찾을 수 없습니다. ID: " + id));
@@ -329,6 +339,18 @@ public class PortalApprovalManService extends BaseService {
             throw new IllegalArgumentException("아직 승인 차례가 아닙니다.");
         }
 
+        // API 이용해지(DELETE) 승인이면 GW 처리방식(차단/완전삭제)을 신청서에 영속화한다.
+        // 같은 EMS 트랜잭션이므로 최종 승인 시 listener 가 이 값을 읽고, REDEPLOY 재처리에서도 유지된다.
+        // 미지정(null)은 안전 기본값인 차단(BLOCK)으로 처리.
+        if (approval.getApprovalType().equals(ApprovalType.APP)) {
+            appRequestRepository.findById(approval.getTargetId()).ifPresent(request -> {
+                if (AppRequestType.DELETE.equals(request.getType())) {
+                    request.setGwAction("DELETE".equalsIgnoreCase(gwAction) ? GwAction.DELETE : GwAction.BLOCK);
+                    appRequestRepository.save(request);
+                }
+            });
+        }
+
         options.put(ApprovalConstants.APPROVER, approverId);
         sendEvent(id, ApprovalEvent.APPROVE, options);
     }
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalListener.java b/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalListener.java
index edc5f2d..247eeaf 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalListener.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalListener.java
@@ -2,6 +2,7 @@ package com.eactive.eai.rms.onl.apim.approval.app;
 
 import com.eactive.apim.portal.apprequest.entity.AppRequest;
 import com.eactive.apim.portal.apprequest.entity.AppRequestType;
+import com.eactive.apim.portal.apprequest.entity.GwAction;
 import com.eactive.apim.portal.apprequest.repository.AppRequestRepository;
 import com.eactive.apim.portal.approval.entity.Approval;
 import com.eactive.apim.portal.approval.service.ApprovalDeployException;
@@ -72,7 +73,7 @@ public class PortalAppApprovalListener implements ApprovalListener {
 
             // 위 메서드가 반환되면 트랜잭션이 커밋되어 Portal DB에 영구 저장됨
             // 이제 APIGW 동기화 및 GW 리로드 수행
-            syncTargetServer(type, credentialUI);
+            syncTargetServer(appRequest, credentialUI);
             sendApprovalResult(appRequest);
         }
     }
@@ -94,7 +95,12 @@ public class PortalAppApprovalListener implements ApprovalListener {
         } else if (type.equals(AppRequestType.MODIFY)) {
             credentialUI = modifyClientUI(appRequest);
         } else if (type.equals(AppRequestType.DELETE)) {
-            credentialManService.delete(appRequest.getClientId());
+            // REDEPLOY 재처리 시 credential 이 이미 삭제되어 있을 수 있으므로 부재는 정상 통과시킨다.
+            try {
+                credentialManService.delete(appRequest.getClientId());
+            } catch (org.springframework.dao.EmptyResultDataAccessException e) {
+                logger.warn("포털 credential 이미 삭제됨 (재처리 통과) - clientId: {}", appRequest.getClientId());
+            }
             credentialUI = new CredentialUI();
             credentialUI.setClientid(appRequest.getClientId());
         }
@@ -119,7 +125,9 @@ public class PortalAppApprovalListener implements ApprovalListener {
         messageSendService.sendMessage(MessageCode.APP_APPROVE, recipient, params);
     }
 
-    private void syncTargetServer(AppRequestType action, CredentialUI credentialUI) throws ApprovalDeployException {
+    private void syncTargetServer(AppRequest appRequest, CredentialUI credentialUI) throws ApprovalDeployException {
+
+        AppRequestType action = appRequest.getType();
 
         DataSourceType type = DataSourceTypeManager.getDataSourceType("APIGW");
         DataSourceContextHolder.setDataSourceType(type);
@@ -129,7 +137,7 @@ public class PortalAppApprovalListener implements ApprovalListener {
         } else if (action.equals(AppRequestType.MODIFY)) {
             clientManService.update(credentialUIMapper.mapClient(credentialUI));
         } else if (action.equals(AppRequestType.DELETE)) {
-            clientManService.delete(credentialUI.getClientid());
+            applyGwActionForDelete(appRequest.getGwAction(), credentialUI.getClientid());
         }
 
         CommonCommand.builder()
@@ -138,6 +146,30 @@ public class PortalAppApprovalListener implements ApprovalListener {
             .build().broadcast(agentUtilService);
     }
 
+    /**
+     * API 이용해지 승인 시 GW 클라이언트(TSEAIAU01) 처리.
+     * 승인 시점에 관리자가 선택해 PTL_APP_REQUEST.GW_ACTION 에 영속화된 값을 따른다.
+     * - DELETE: 행 완전 삭제 / - BLOCK 또는 null(미지정): 차단(appstatus='0')
+     * GW 에 행이 이미 없으면(선삭제·재처리) 목적이 달성된 상태이므로 통과시키고,
+     * 그 외 오류는 ApprovalDeployException 으로 던져 FAILED(재처리 가능) 상태를 만든다.
+     */
+    private void applyGwActionForDelete(GwAction gwAction, String clientId) throws ApprovalDeployException {
+        try {
+            if (GwAction.DELETE.equals(gwAction)) {
+                clientManService.delete(clientId);
+                logger.info("GW 클라이언트 완전 삭제 - clientId: {}", clientId);
+            } else {
+                clientManService.blockClient(clientId);
+                logger.info("GW 클라이언트 차단(appstatus=0) - clientId: {}", clientId);
+            }
+        } catch (org.springframework.dao.EmptyResultDataAccessException | javax.persistence.EntityNotFoundException e) {
+            logger.warn("GW 클라이언트가 이미 존재하지 않아 처리 생략 (재처리 통과) - clientId: {}", clientId);
+        } catch (RuntimeException e) {
+            logger.error("GW 클라이언트 해지 처리 실패 - clientId: {}, gwAction: {}", clientId, gwAction, e);
+            throw new ApprovalDeployException("GW 클라이언트 해지 처리에 실패했습니다: " + e.getMessage());
+        }
+    }
+
     private CredentialUI modifyClientUI(AppRequest appRequest) {
         CredentialUI existingCredential = credentialManService.selectDetail(appRequest.getClientId());
         existingCredential.getApiList().clear();
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalUI.java b/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalUI.java
index 3d21bfa..4cf9ae9 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalUI.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/approval/app/PortalAppApprovalUI.java
@@ -1,6 +1,7 @@
 package com.eactive.eai.rms.onl.apim.approval.app;
 
 import com.eactive.apim.portal.apprequest.entity.AppRequestType;
+import com.eactive.apim.portal.apprequest.entity.GwAction;
 import com.eactive.eai.rms.onl.apim.apigroup.ui.ApiGroupUI;
 import com.eactive.eai.rms.onl.apim.approval.PortalApprovalUI;
 import java.util.ArrayList;
@@ -26,4 +27,7 @@ public class PortalAppApprovalUI extends PortalApprovalUI {
     private List<String> prevApiGroupNameList = new ArrayList<>();
 
     private AppRequestType requestType;
+
+    //DELETE 승인 시 선택된 GW 처리방식 (승인 완료 건 상세 표시용)
+    private GwAction gwAction;
 }