diff --git a/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp b/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
index 38aaca6..922b23b 100644
--- a/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
+++ b/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
@@ -285,6 +285,56 @@
                 }
             });
 
+            $("#btn_sync_portal").click(function() {
+                var clientId = $('input[name=clientId]').val();
+                var clientName = $('input[name=clientName]').val();
+
+                if (!clientId) {
+                    alert("Client ID가 없습니다.");
+                    return;
+                }
+
+                if (!confirm("'" + clientName + "'의 개발자포탈 정보를 반영하시겠습니까?\n\n" +
+                             "APIGW 인증 정보를 포탈 DB에 반영합니다. (없으면 생성, 있으면 업데이트)")) {
+                    return;
+                }
+
+                $.ajax({
+                    type: "POST",
+                    url: url,
+                    dataType: "json",
+                    data: {
+                        cmd: 'SYNC_PORTAL',
+                        clientId: clientId
+                    },
+                    success: function(response) {
+                        if (response.success) {
+                            var msg = "포탈 정보 반영 완료";
+
+                            if (response.action === 'INSERTED') {
+                                msg = "포탈 정보를 새로 생성했습니다.";
+                            } else if (response.action === 'UPDATED') {
+                                msg = "포탈 정보를 업데이트했습니다.";
+                            } else if (response.action === 'SKIPPED_NO_ORG') {
+                                msg = "반영을 건너뜁니다.\n법인(orgId)이 설정되지 않은 클라이언트입니다.";
+                            } else if (response.action === 'SKIPPED_INVALID_API') {
+                                msg = "반영을 건너뜁니다.\n존재하지 않는 API가 포함되어 있습니다.\n\n";
+                                if (response.invalidApis && response.invalidApis.length > 0) {
+                                    msg += "누락된 API: " + response.invalidApis.join(", ");
+                                }
+                            }
+
+                            alert(msg);
+                        } else {
+                            alert("반영 실패\n\n" + response.message);
+                        }
+                    },
+                    error: function(xhr) {
+                        alert("반영 중 오류가 발생했습니다.");
+                    }
+                });
+            });
+
             $("#btn_popup_api").click(function () {
                 const args = {};
                 const url2 = api_url_view += "?cmd=POPUP";
@@ -417,6 +467,8 @@
     </div><!-- end content_top -->
     <div class="content_middle">
         <div class="search_wrap">
+            <button type="button" class="cssbtn" id="btn_sync_portal" level="W" status="DETAIL"><i class="material-icons">sync</i> 개발자포탈 정보 반영
+            </button>
             <button type="button" class="cssbtn" id="btn_delete" level="W" status="DETAIL"><i class="material-icons">delete</i> <%= localeMessage.getString("button.delete") %>
             </button>
             <button type="button" class="cssbtn" id="btn_modify" level="W" status="DETAIL,NEW"><i
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/approval/credential/CredentialUI.java b/src/main/java/com/eactive/eai/rms/onl/apim/approval/credential/CredentialUI.java
index 248e3b1..0ee6ecf 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/approval/credential/CredentialUI.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/approval/credential/CredentialUI.java
@@ -55,4 +55,6 @@ public class CredentialUI implements Serializable, com.eactive.eai.data.Data {
     private List<ApiSpecInfoUI> apiList = new ArrayList<>();
 
     private String appIconFileId;
+
+    private String appDescription;
 }
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
index c8f1425..02ee4dc 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
@@ -121,4 +121,37 @@ public class ClientController extends OnlBaseAnnotationController {
         response.put("hasMtls", hasMtls);
         return ResponseEntity.ok(response);
     }
+
+    /**
+     * APIGW 인증관리 정보를 개발자포탈에 반영합니다.
+     * 포탈에 없으면 신규 생성, 있으면 업데이트합니다.
+     *
+     * @param clientId 클라이언트 ID
+     * @return 반영 결과 (success, action, message, invalidApis)
+     */
+    @PostMapping(value = "/onl/admin/authserver/clientMan.json", params = "cmd=SYNC_PORTAL")
+    public ResponseEntity<Map<String, Object>> syncPortalData(String clientId) {
+        try {
+            SyncResult result = clientManService.syncPortalData(clientId);
+
+            Map<String, Object> response = new HashMap<>();
+            response.put("success", result.isSuccess());
+            response.put("message", result.getMessage());
+            response.put("action", result.getAction().name());
+
+            // 유효하지 않은 API 목록 포함
+            if (result.getInvalidApis() != null && !result.getInvalidApis().isEmpty()) {
+                response.put("invalidApis", result.getInvalidApis());
+            }
+
+            return ResponseEntity.ok(response);
+        } catch (Exception e) {
+            // 에러 처리
+            Map<String, Object> error = new HashMap<>();
+            error.put("success", false);
+            error.put("message", "반영 중 오류: " + e.getMessage());
+            error.put("action", "ERROR");
+            return ResponseEntity.status(500).body(error);
+        }
+    }
 }
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
index cb02cab..17d9874 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
@@ -1,9 +1,20 @@
 package com.eactive.eai.rms.onl.manage.authserver.client;
 
+import com.eactive.apim.portal.app.entity.Credential;
 import com.eactive.apim.portal.portalorg.entity.PortalOrg;
+import com.eactive.eai.data.entity.onl.eaimsg.EAIMessageEntity;
+import com.eactive.eai.rms.common.datasource.DataSourceContextHolder;
+import com.eactive.eai.rms.common.datasource.DataSourceType;
+import com.eactive.eai.rms.common.datasource.DataSourceTypeManager;
 import com.eactive.eai.rms.data.entity.onl.apim.portalorg.PortalOrgService;
+import com.eactive.eai.rms.data.entity.onl.eaimsg.EAIMessageRepository;
+import com.eactive.eai.rms.onl.apim.approval.credential.CredentialManService;
+import com.eactive.eai.rms.onl.apim.approval.credential.CredentialService;
+import com.eactive.eai.rms.onl.apim.approval.credential.CredentialUI;
 import com.eactive.eai.rms.onl.apim.portalorg.PortalOrgUI;
 import com.eactive.eai.rms.onl.apim.portalorg.PortalOrgUIMapper;
+import com.eactive.eai.rms.onl.transaction.apim.ui.ApiSpecInfoUI;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -15,8 +26,10 @@ import com.eactive.eai.rms.common.base.OnlBaseService;
 import com.eactive.eai.rms.data.entity.onl.authserver.ClientEntityService;
 import com.eactive.eai.rms.data.entity.onl.authserver.ClientSearch;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Service
@@ -27,16 +40,25 @@ public class ClientManService extends OnlBaseService {
 	private ClientUIMapper clientUIMapper;
 	private PortalOrgService portalOrgService;
 	private PortalOrgUIMapper portalOrgUIMapper;
+	private CredentialManService credentialManService;
+	private CredentialService credentialService;
+	private EAIMessageRepository eaiMessageRepository;
 
 	@Autowired
 	public ClientManService(ClientEntityService clientEntityService,
 							ClientUIMapper clientUIMapper,
 							PortalOrgService portalOrgService,
-							PortalOrgUIMapper portalOrgUIMapper) {
+							PortalOrgUIMapper portalOrgUIMapper,
+							CredentialManService credentialManService,
+							CredentialService credentialService,
+							EAIMessageRepository eaiMessageRepository) {
 		this.clientEntityService = clientEntityService;
 		this.clientUIMapper = clientUIMapper;
 		this.portalOrgService = portalOrgService;
 		this.portalOrgUIMapper = portalOrgUIMapper;
+		this.credentialManService = credentialManService;
+		this.credentialService = credentialService;
+		this.eaiMessageRepository = eaiMessageRepository;
 	}
 
 
@@ -83,4 +105,161 @@ public class ClientManService extends OnlBaseService {
 				.map(ClientEntity::getClientid)
 				.collect(Collectors.toList());
 	}
+
+	/**
+	 * AGW 인증관리(ClientEntity)의 정보를 개발자포탈(Credential)에 반영합니다.
+	 * 포탈에 없으면 신규 생성(INSERT), 있으면 업데이트(UPDATE)합니다.
+	 *
+	 * @param clientId 클라이언트 ID
+	 * @return 반영 결과 (INSERTED, UPDATED, SKIPPED_NO_ORG, SKIPPED_INVALID_API, ERROR)
+	 */
+	public SyncResult syncPortalData(String clientId) {
+		try {
+			// 1. APIGW 스키마에서 ClientEntity 조회
+			ClientEntity clientEntity = clientEntityService.getById(clientId);
+
+			// 2. 유효성 검증 - orgId 확인
+			String orgId = clientEntity.getOrgid();
+			if (StringUtils.isBlank(orgId)) {
+				return SyncResult.builder()
+						.success(false)
+						.action(SyncResult.SyncAction.SKIPPED_NO_ORG)
+						.message("법인(orgId)이 설정되지 않은 클라이언트입니다.")
+						.build();
+			}
+
+			// 3. API 유효성 검증 (APIGW 스키마)
+			List<String> invalidApis = new ArrayList<>();
+			if (clientEntity.getApiList() != null) {
+				for (EAIMessageEntity apiEntity : clientEntity.getApiList()) {
+					String eaiSvcName = apiEntity.getEaiSvcName();
+					// APIGW에 실제 API 존재하는지 확인
+					if (!eaiMessageRepository.existsById(eaiSvcName)) {
+						invalidApis.add(eaiSvcName);
+					}
+				}
+			}
+
+			// 유효하지 않은 API가 있으면 반영 중단
+			if (!invalidApis.isEmpty()) {
+				return SyncResult.builder()
+						.success(false)
+						.action(SyncResult.SyncAction.SKIPPED_INVALID_API)
+						.invalidApis(invalidApis)
+						.message("존재하지 않는 API: " + String.join(", ", invalidApis))
+						.build();
+			}
+
+			// 4. MONITORING 스키마로 전환
+			DataSourceType monitoringType = DataSourceTypeManager.getDataSourceType("MONITORING");
+			DataSourceContextHolder.setDataSourceType(monitoringType);
+
+			// 5. 기존 Credential 확인
+			Optional<Credential> existingCredential = credentialService.getRepository()
+					.findOne((root, query, cb) -> cb.and(
+							cb.equal(root.get("clientid"), clientId),
+							cb.equal(root.get("orgid"), orgId)
+					));
+
+			// 6. 데이터 변환 (ClientEntity → CredentialUI)
+			CredentialUI credentialUI = convertToCredentialUI(clientEntity);
+
+			SyncResult.SyncAction action;
+			if (existingCredential.isPresent()) {
+				// 업데이트: 기존 값 유지해야 할 필드 처리
+				Credential existing = existingCredential.get();
+				if (StringUtils.isNotBlank(existing.getAppDescription())) {
+					credentialUI.setAppDescription(existing.getAppDescription());
+				}
+				if (StringUtils.isNotBlank(existing.getAppIconFileId())) {
+					credentialUI.setAppIconFileId(existing.getAppIconFileId());
+				}
+				if (StringUtils.isNotBlank(existing.getServer())) {
+					credentialUI.setServer(existing.getServer());
+				}
+
+				// 7. 포탈 스키마에 업데이트
+				credentialManService.update(credentialUI);
+				action = SyncResult.SyncAction.UPDATED;
+			} else {
+				// 신규 생성: 기본값 설정
+				if (StringUtils.isBlank(credentialUI.getAppDescription())) {
+					credentialUI.setAppDescription("APIGW에서 반영된 인증정보");
+				}
+
+				// 7. 포탈 스키마에 신규 생성
+				credentialManService.insert(credentialUI);
+				action = SyncResult.SyncAction.INSERTED;
+			}
+
+			return SyncResult.builder()
+					.success(true)
+					.action(action)
+					.message("포탈 정보 반영 완료")
+					.build();
+
+		} catch (Exception e) {
+			logger.error("포탈 정보 반영 중 오류 발생", e);
+			return SyncResult.builder()
+					.success(false)
+					.action(SyncResult.SyncAction.ERROR)
+					.message("반영 중 오류: " + e.getMessage())
+					.build();
+		}
+	}
+
+	/**
+	 * ClientEntity를 CredentialUI로 변환합니다.
+	 *
+	 * @param clientEntity APIGW 클라이언트 엔티티
+	 * @return CredentialUI 포탈 인증정보 UI 객체
+	 */
+	private CredentialUI convertToCredentialUI(ClientEntity clientEntity) {
+		CredentialUI credentialUI = new CredentialUI();
+
+		// 기본 인증정보
+		credentialUI.setClientid(clientEntity.getClientid());
+		credentialUI.setClientname(clientEntity.getClientname());
+		credentialUI.setClientsecret(clientEntity.getClientsecret());
+
+		// OAuth 설정
+		credentialUI.setScope(clientEntity.getScope());
+		credentialUI.setGranttypes(clientEntity.getGranttypes());
+		credentialUI.setAccesstokenvalidityseconds(clientEntity.getAccesstokenvalidityseconds());
+		credentialUI.setRefreshtokenvalidityseconds(clientEntity.getRefreshtokenvalidityseconds());
+
+		// 보안 설정
+		credentialUI.setAllowedips(clientEntity.getAllowedips());
+		credentialUI.setAuthorities(clientEntity.getAuthorities());
+		credentialUI.setRedirecturi(clientEntity.getRedirecturi());
+		credentialUI.setSecuritykey(clientEntity.getSecuritykey());
+		credentialUI.setAutoapprove(clientEntity.getAutoapprove());
+		credentialUI.setResourceids(clientEntity.getResourceids());
+
+		// 조직 정보
+		credentialUI.setOrgid(clientEntity.getOrgid());
+		credentialUI.setOrgname(clientEntity.getOrgname());
+
+		// 앱 상태
+		credentialUI.setAppstatus(clientEntity.getAppstatus());
+		credentialUI.setDailytokenlimit(Integer.parseInt(
+				StringUtils.defaultIfBlank(clientEntity.getDailytokenlimit(), "0")));
+
+		// 수정 정보
+		credentialUI.setModifiedby(clientEntity.getModifiedby());
+		credentialUI.setModifiedon(clientEntity.getModifiedon());
+
+		// API 목록 변환
+		List<ApiSpecInfoUI> apiList = new ArrayList<>();
+		if (clientEntity.getApiList() != null) {
+			for (EAIMessageEntity apiEntity : clientEntity.getApiList()) {
+				ApiSpecInfoUI apiUI = new ApiSpecInfoUI();
+				apiUI.setApiId(apiEntity.getEaiSvcName());
+				apiList.add(apiUI);
+			}
+		}
+		credentialUI.setApiList(apiList);
+
+		return credentialUI;
+	}
 }
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java
new file mode 100644
index 0000000..753b7e6
--- /dev/null
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java
@@ -0,0 +1,68 @@
+package com.eactive.eai.rms.onl.manage.authserver.client;
+
+import java.util.List;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 개발자포탈 정보 반영 결과 DTO
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class SyncResult {
+
+    /**
+     * 반영 성공 여부
+     */
+    private boolean success;
+
+    /**
+     * 결과 메시지
+     */
+    private String message;
+
+    /**
+     * 반영 액션 타입
+     */
+    private SyncAction action;
+
+    /**
+     * 존재하지 않는 API 목록 (SKIPPED_INVALID_API인 경우)
+     */
+    private List<String> invalidApis;
+
+    /**
+     * 반영 액션 타입
+     */
+    public enum SyncAction {
+        /**
+         * 신규 생성
+         */
+        INSERTED,
+
+        /**
+         * 기존 데이터 업데이트
+         */
+        UPDATED,
+
+        /**
+         * orgId 없어서 건너뜀
+         */
+        SKIPPED_NO_ORG,
+
+        /**
+         * 유효하지 않은 API 존재로 건너뜀
+         */
+        SKIPPED_INVALID_API,
+
+        /**
+         * 오류 발생
+         */
+        ERROR
+    }
+}