diff --git a/src/main/java/com/sesac/boheommong/BoheommongApplication.java b/src/main/java/com/sesac/boheommong/BoheommongApplication.java
index 6c9ca03..ca73093 100644
--- a/src/main/java/com/sesac/boheommong/BoheommongApplication.java
+++ b/src/main/java/com/sesac/boheommong/BoheommongApplication.java
@@ -3,7 +3,9 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.PropertySource;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
+@EnableScheduling
 @SpringBootApplication
 public class BoheommongApplication {
 
diff --git a/src/main/java/com/sesac/boheommong/domain/notification/repository/EmitterRepositoryImpl.java b/src/main/java/com/sesac/boheommong/domain/notification/repository/EmitterRepositoryImpl.java
index c62d68f..f1014a9 100644
--- a/src/main/java/com/sesac/boheommong/domain/notification/repository/EmitterRepositoryImpl.java
+++ b/src/main/java/com/sesac/boheommong/domain/notification/repository/EmitterRepositoryImpl.java
@@ -34,7 +34,7 @@ public Map<String, SseEmitter> findAllEmitterByUserId(String userId) {
 
     @Override
     public Map<String, Object> findAllEventCacheByUserId(String userId) {
-        return emitters.entrySet().stream()
+        return eventCache.entrySet().stream()
                 .filter(entry -> entry.getKey().startsWith(userId))
                 .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
     }
diff --git a/src/main/java/com/sesac/boheommong/domain/tosspayment/controller/WidgetController.java b/src/main/java/com/sesac/boheommong/domain/tosspayment/controller/WidgetController.java
index ac71258..83c42a7 100644
--- a/src/main/java/com/sesac/boheommong/domain/tosspayment/controller/WidgetController.java
+++ b/src/main/java/com/sesac/boheommong/domain/tosspayment/controller/WidgetController.java
@@ -1,5 +1,7 @@
 package com.sesac.boheommong.domain.tosspayment.controller;
 
+import com.sesac.boheommong.domain.notification.service.NotificationService;
+import lombok.RequiredArgsConstructor;
 import net.minidev.json.JSONObject;
 import net.minidev.json.parser.JSONParser;
 import net.minidev.json.parser.ParseException;
@@ -21,10 +23,13 @@
 import java.util.Base64;
 
 @Controller
+@RequiredArgsConstructor
 public class WidgetController {
 
     private final Logger logger = LoggerFactory.getLogger(this.getClass());
 
+    private final NotificationService notificationService;
+
     @RequestMapping(value = "/confirm")
     public ResponseEntity<JSONObject> confirmPayment(@RequestBody String jsonBody) throws Exception {
 
@@ -75,6 +80,28 @@ public ResponseEntity<JSONObject> confirmPayment(@RequestBody String jsonBody) t
         JSONObject jsonObject = (JSONObject) parser.parse(reader);
         responseStream.close();
 
+        // (3) 결제가 성공했다면 SSE 알림 발송
+        if (isSuccess) {
+            logger.info("결제 성공: orderId={}, amount={}", orderId, amount);
+
+            // 예: orderId로 사용자 이메일이나 userId를 DB에서 찾아오거나,
+            // 일단 임시로 하드코딩한 이메일로 알림 전송:
+            String userEmail = "dummyUser@somewhere.com";
+
+            // 알림 메시지 예시
+            String content = String.format("결제가 성공적으로 완료되었습니다. 결제금액: %s원", amount);
+
+            // SSE 알림 발행
+            notificationService.send(
+                    userEmail,          // 기존의 SSE 구독이 userEmail로 되어 있다면 이 값 사용
+                    null,               // 알림 타입 (사용한다면 ENUM 넣기)
+                    content,
+                    null                // 클릭 시 이동할 URL
+            );
+        } else {
+            logger.warn("결제 실패: code={}, response={}", code, jsonObject);
+        }
+
         return ResponseEntity.status(code).body(jsonObject);
     }
 }
diff --git a/src/main/java/com/sesac/boheommong/domain/tosspayment/repository/AutoPaymentRepository.java b/src/main/java/com/sesac/boheommong/domain/tosspayment/repository/AutoPaymentRepository.java
index b909454..9807b4c 100644
--- a/src/main/java/com/sesac/boheommong/domain/tosspayment/repository/AutoPaymentRepository.java
+++ b/src/main/java/com/sesac/boheommong/domain/tosspayment/repository/AutoPaymentRepository.java
@@ -13,4 +13,6 @@ public interface AutoPaymentRepository extends JpaRepository<AutoPayment, Long>
      * AutoPayment 엔티티 내부의 user 필드(연관관계) → user.userId
      */
     List<AutoPayment> findByUser_UserId(Long userId);
+
+    List<AutoPayment> findByDayOfMonth(int dayOfMonth);
 }
diff --git a/src/main/java/com/sesac/boheommong/domain/tosspayment/scheduler/AutoPaymentScheduler.java b/src/main/java/com/sesac/boheommong/domain/tosspayment/scheduler/AutoPaymentScheduler.java
new file mode 100644
index 0000000..74cf7df
--- /dev/null
+++ b/src/main/java/com/sesac/boheommong/domain/tosspayment/scheduler/AutoPaymentScheduler.java
@@ -0,0 +1,60 @@
+package com.sesac.boheommong.domain.tosspayment.scheduler;
+
+import com.sesac.boheommong.domain.tosspayment.entity.AutoPayment;
+import com.sesac.boheommong.domain.tosspayment.repository.AutoPaymentRepository;
+import com.sesac.boheommong.domain.notification.service.NotificationService;
+import com.sesac.boheommong.domain.notification.enums.NotificationType;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.util.List;
+
+@Component
+@RequiredArgsConstructor
+@Slf4j
+public class AutoPaymentScheduler {
+
+    private final AutoPaymentRepository autoPaymentRepository;
+    private final NotificationService notificationService;
+
+    /**
+     * 매일 오전 0시(혹은 원하는 시각)에 실행
+     * - “내일 자동결제 예정”인 AutoPayment 찾아서, 알림 발행
+     */
+    @Scheduled(cron = "0 0 0 * * *")
+    public void notifyBeforeAutoPayment() {
+        log.info("자동결제 전날 알림 스케줄러 실행...");
+
+        // (1) 오늘 날짜 계산
+        LocalDate today = LocalDate.now();
+
+        // (2) "내일" 자동이체가 예정된 AutoPayment 찾기
+        //  - dayOfMonth == tomorrow's day
+        //  - time은 결제 시각이지만, 전날 알림이므로 여기서는 dayOfMonth만 체크
+        int tomorrowDay = today.plusDays(1).getDayOfMonth();
+
+        // dayOfMonth가 tomorrowDay인 AutoPayment 목록 (DB 쿼리 방식은 상황에 따라 다름)
+        List<AutoPayment> autoPayments = autoPaymentRepository.findByDayOfMonth(tomorrowDay);
+
+        // (3) 알림 발행
+        for (AutoPayment ap : autoPayments) {
+            Long userId = ap.getUser().getUserId();
+
+            // 메시지 예시
+            String content = "내일 (" + tomorrowDay + "일) 자동결제가 예정되어 있습니다. (상품ID: " + ap.getProduct().getProductId() + ")";
+
+            // Redis를 통해 발행(멀티 서버)
+            notificationService.publishNotification(
+                    userId,
+                    content,
+                    "/mypage/autoPayment"  // 알림 클릭 시 이동할 URL (예시)
+            );
+
+            log.info("자동결제 전날 알림 발행 - userId={}, autoPaymentId={}", userId, ap.getId());
+        }
+    }
+}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index f943ae5..577d067 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -40,7 +40,7 @@ spring:
             client-id: ${KAKAO_OAUTH_CLIENT_ID}
             client-secret: ${KAKAO_OAUTH_CLIENT_SECRET}
             authorization-grant-type: authorization_code
-            redirect-uri: https://boheommong.site/login/oauth2/code/kakao
+            redirect-uri: http://localhost:8080/login/oauth2/code/kakao
             client-authentication-method: client_secret_post
             scope:
               - profile_nickname