diff --git a/.github/workflows/ci_gradle.yml b/.github/workflows/ci_gradle.yml
index dda82537..1b3ac95e 100644
--- a/.github/workflows/ci_gradle.yml
+++ b/.github/workflows/ci_gradle.yml
@@ -24,8 +24,8 @@ jobs:
           echo "spring:" > application.yml
           echo "  profiles:" >> application.yml
           echo "    group:" >> application.yml
-          echo "      "local": "db, s3, secret"" >> application.yml
-          echo "      "prod": "db, s3, redis"" >> application.yml
+          echo "      "local": "db, s3, email, portone, secret"" >> application.yml
+          echo "      "prod": "db, s3, redis, email, portone"" >> application.yml
           echo "    default: prod" >> application.yml
           
           echo "  servlet:" >> application.yml
@@ -49,13 +49,8 @@ jobs:
           spring.jwt.secret: ${{ secrets.JWT_SECRET }}
           spring.jwt.token.access-expiration-time: ${{ secrets.JWT_ACCESS_EXPIRATION_TIME }}
           spring.jwt.token.refresh-expiration-time: ${{ secrets.JWT_REFRESH_EXPIRATION_TIME }}
-          mail.smtp.port: ${{ secrets.EMAIL_PORT }}
-          AdminMail.id: ${{ secrets.EMAIL_ID }}
-          AdminMail.password: ${{ secrets.EMAIL_PASSWORD }}
           firebase.fcmUrl: ${{ secrets.FIREBASE_URL}}
           firebase.firebaseConfigPath: ${{ secrets.FIREBASE_PATH}}
-          PORT_ONE_KEY: ${{ secrets.PORT_ONE_KEY}}
-          PORT_ONE_SECRET: ${{ secrets.PORT_ONE_SECRET}}
 
       - name: 4) Set application-db.yml
         uses: microsoft/variable-substitution@v1
@@ -84,6 +79,23 @@ jobs:
           spring.data.redis.host: ${{ secrets.REDIS_HOST }}
           spring.data.redis.port: ${{ secrets.REDIS_PORT }}
 
+      - name: 7) Set application-email.yml
+        uses: microsoft/variable-substitution@v1
+        with:
+          files: ./core/core-infra-email/src/main/resources/application-email.yml
+        env:
+          mail.smtp.port: ${{ secrets.EMAIL_PORT }}
+          AdminMail.id: ${{ secrets.EMAIL_ID }}
+          AdminMail.password: ${{ secrets.EMAIL_PASSWORD }}
+
+      - name: 8) Set application-portone.yml
+        uses: microsoft/variable-substitution@v1
+        with:
+          files: ./core/core-infra-portone/src/main/resources/application-portone.yml
+        env:
+          PORT_ONE_KEY: ${{ secrets.PORT_ONE_KEY}}
+          PORT_ONE_SECRET: ${{ secrets.PORT_ONE_SECRET}}
+
       - name: Grant execute permission for gradlew and build
         run: |
           chmod +x ./gradlew
diff --git a/api/build.gradle b/api/build.gradle
index 73f1a778..5129809c 100644
--- a/api/build.gradle
+++ b/api/build.gradle
@@ -4,6 +4,8 @@ dependencies {
     implementation project(':core:core-infra-db');
     implementation project(':core:core-infra-s3');
     implementation project(':core:core-infra-redis');
+    implementation project(':core:core-infra-email');
+    implementation project(':core:core-infra-portone');
 
     // Core
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
@@ -15,9 +17,9 @@ dependencies {
     implementation 'org.slf4j:slf4j-api:2.0.7'
 
     // Lombok
-    implementation 'org.projectlombok:lombok:1.18.22'
-    annotationProcessor('org.projectlombok:lombok')
-    testAnnotationProcessor('org.projectlombok:lombok')
+//    implementation 'org.projectlombok:lombok:1.18.22'
+//    annotationProcessor('org.projectlombok:lombok')
+//    testAnnotationProcessor('org.projectlombok:lombok')
 
     // Jwt
     implementation 'io.jsonwebtoken:jjwt-api:0.12.3'
@@ -31,16 +33,9 @@ dependencies {
     // Validation
     implementation 'org.springframework.boot:spring-boot-starter-validation'
 
-    // email
-    implementation 'org.springframework.boot:spring-boot-starter-mail'
-
     // FCM
     implementation 'com.google.firebase:firebase-admin:9.1.1'
     implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '4.2.2'
-
-    // Iamport
-    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
-    implementation 'com.github.iamport:iamport-rest-client-java:0.2.23'
 }
 bootJar { enabled = true }
 jar { enabled = false }
diff --git a/api/out/production/resources/application-local.yml b/api/out/production/resources/application-local.yml
deleted file mode 100644
index fc0720fc..00000000
--- a/api/out/production/resources/application-local.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-server:
-  port: 8080
-
-spring:
-  jwt:
-    secret: EENY5W0eegTf1naQB2eDeyCLl5kRS2b8xa5c4qLdS0hmVjtbvo8tOyhPMcAmtPuQ
-    token:
-      access-expiration-time: 999999999
-      refresh-expiration-time: 999999999
-
-  data:
-    redis:
-      host: localhost
-      port: 6379
diff --git a/api/out/production/resources/application-prod.yml b/api/out/production/resources/application-prod.yml
deleted file mode 100644
index 8dcd5ffd..00000000
--- a/api/out/production/resources/application-prod.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-server:
-  port: 8080
-
-spring:
-  jwt:
-    secret: ${JWT_SECRET}
-    token:
-      access-expiration-time: ${JWT_ACCESS_EXPIRATION_TIME}
-      refresh-expiration-time: ${JWT_REFRESH_EXPIRATION_TIME}
-
-  data:
-    redis:
-      host: ${REDIS_HOST}
-      port: ${REDIS_PORT}
-
-mail:
-  smtp:
-    port: ${EMAIL_PORT}
-    auth: true
-    starttls:
-      required: true
-      enable: true
-    socketFactory:
-      class: javax.net.ssl.SSLSocketFactory
-      fallback: false
-
-AdminMail:
-  id: ${EMAIL_ID}
-  password: ${EMAIL_PASSWORD}
-
-firebase:
-  fcmUrl: ${FIREBASE_URL}
-  firebaseConfigPath: ${FIREBASE_PATH}
-  scope: https://www.googleapis.com/auth/cloud-platform
-
-PORT_ONE_KEY: ${PORT_ONE_KEY}
-PORT_ONE_SECRET: ${PORT_ONE_SECRET}
diff --git a/api/out/production/resources/application.yml b/api/out/production/resources/application.yml
deleted file mode 100644
index 0a6b6276..00000000
--- a/api/out/production/resources/application.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-server:
-  port: 8080
-
-spring:
-  profiles:
-    group:
-      "local": "db, s3, secret"
-      "prod": "db, s3"
-    default: local
-
-  servlet:
-    multipart:
-      max-file-size: 20MB
-      max-request-size: 20MB
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java b/api/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
index 69466215..0c44cf49 100644
--- a/api/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
+++ b/api/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
@@ -3,9 +3,7 @@
 import static com.sponus.sponusbe.domain.organization.exception.OrganizationErrorCode.*;
 
 import java.util.List;
-import java.util.Random;
 
-import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -15,6 +13,7 @@
 import com.sponus.coredomain.domain.notification.repository.NotificationRepository;
 import com.sponus.coredomain.domain.organization.Organization;
 import com.sponus.coredomain.domain.organization.repository.OrganizationRepository;
+import com.sponus.coreinfraemail.EmailUtil;
 import com.sponus.coreinfras3.S3Util;
 import com.sponus.sponusbe.domain.notification.exception.NotificationErrorCode;
 import com.sponus.sponusbe.domain.notification.exception.NotificationException;
@@ -24,8 +23,6 @@
 import com.sponus.sponusbe.domain.organization.dto.OrganizationUpdateRequest;
 import com.sponus.sponusbe.domain.organization.exception.OrganizationException;
 
-import jakarta.mail.internet.InternetAddress;
-import jakarta.mail.internet.MimeMessage;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
@@ -38,8 +35,8 @@ public class OrganizationService {
 	private final OrganizationRepository organizationRepository;
 	private final NotificationRepository notificationRepository;
 	private final PasswordEncoder passwordEncoder;
-	private final JavaMailSender emailSender;
 	private final S3Util s3Util;
+	private final EmailUtil emailUtil;
 
 	public OrganizationJoinResponse join(OrganizationJoinRequest request) {
 		final Organization organization = organizationRepository.save(
@@ -72,57 +69,7 @@ public void deactivateOrganization(Long organizationId) {
 	}
 
 	public String sendEmail(String to) throws Exception {
-		String code = createEmailCode();
-		MimeMessage message = createEmail(to, code);
-		emailSender.send(message);
-		return code;
-	}
-
-	private MimeMessage createEmail(String to, String code) throws Exception {
-		log.info("보내는 대상 : " + to);
-		log.info("인증 코드 : " + code);
-		MimeMessage message = emailSender.createMimeMessage();
-		message.addRecipients(MimeMessage.RecipientType.TO, to); // 보내는 대상
-		message.setSubject("Spon-us 인증 코드 발급입니다."); // 제목
-
-		String msgg = "";
-		msgg += "<div style='margin:20px;'>";
-		msgg += "<h1> Spon-us 인증 코드입니다. </h1>"; // 동적으로 메시지 내용 변경
-		msgg += "<br>";
-		msgg += "<div align='center' style='border:1px solid black; font-family:verdana';>";
-		msgg += "<h3 style='color:blue;'> 인증 코드 </h3>";
-		msgg += "<div style='font-size:130%'>";
-		msgg += "인증 코드 : <strong>";
-		msgg += code + "</strong><div><br/> ";
-		msgg += "</div>";
-		message.setText(msgg, "utf-8", "html"); // 내용
-		message.setFrom(new InternetAddress("Spon-us_team", "Spon-us")); // 보내는 사람
-
-		return message;
-	}
-
-	public static String createEmailCode() {
-		StringBuilder code = new StringBuilder();
-		Random rnd = new Random();
-
-		for (int i = 0; i < 6; i++) { // 인증 코드 6자리
-			int index = rnd.nextInt(3); // 0~2 까지 랜덤
-			switch (index) {
-				case 0:
-					code.append((char)((rnd.nextInt(26)) + 97));
-					//  a~z  (ex. 1+97=98 => (char)98 = 'b')
-					break;
-				case 1:
-					code.append((char)((rnd.nextInt(26)) + 65));
-					//  A~Z
-					break;
-				default:
-					code.append((rnd.nextInt(10)));
-					// 0~9
-					break;
-			}
-		}
-		return code.toString();
+		return emailUtil.sendEmail(to);
 	}
 
 	public List<OrganizationSummaryResponse> searchOrganization(String keyword) {
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentController.java b/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentController.java
deleted file mode 100644
index bf7b017a..00000000
--- a/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentController.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package com.sponus.sponusbe.domain.payment.controller;
-
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RestController;
-
-import com.siot.IamportRestClient.response.Payment;
-import com.sponus.coredomain.domain.common.ApiResponse;
-import com.sponus.coredomain.domain.organization.Organization;
-import com.sponus.sponusbe.auth.annotation.AuthOrganization;
-import com.sponus.sponusbe.domain.payment.dto.PaymentRequest;
-import com.sponus.sponusbe.domain.payment.service.PaymentService;
-
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-
-@Slf4j
-@RestController
-@RequiredArgsConstructor
-public class PaymentController {
-
-	private final PaymentService paymentService;
-
-	@PostMapping("/api/v1/payments")
-	public ApiResponse<Payment> paymentByImpUid(
-		@AuthOrganization Organization authOrganization,
-		@RequestBody PaymentRequest request) {
-		return ApiResponse.onSuccess(paymentService.paymentByImpUid(request, authOrganization));
-	}
-}
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentViewController.java b/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentViewController.java
deleted file mode 100644
index a1364911..00000000
--- a/api/src/main/java/com/sponus/sponusbe/domain/payment/controller/PaymentViewController.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.sponus.sponusbe.domain.payment.controller;
-
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.GetMapping;
-
-@Controller
-public class PaymentViewController {
-	@GetMapping("/payment")
-	public String payment() {
-		return "payment";
-	}
-}
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/propose/exception/ProposeErrorCode.java b/api/src/main/java/com/sponus/sponusbe/domain/propose/exception/ProposeErrorCode.java
index 608001d1..50aa9b25 100644
--- a/api/src/main/java/com/sponus/sponusbe/domain/propose/exception/ProposeErrorCode.java
+++ b/api/src/main/java/com/sponus/sponusbe/domain/propose/exception/ProposeErrorCode.java
@@ -17,9 +17,7 @@ public enum ProposeErrorCode implements BaseErrorCode {
 	INVALID_PROPOSED_ORGANIZATION(HttpStatus.BAD_REQUEST, "PROP4003", "제안을 받은 단체만 접근이 가능합니다."),
 	PROPOSE_STATUS_NOT_PENDING(HttpStatus.BAD_REQUEST, "PROP4004", "수락 대기 중인 제안만 수정이 가능합니다."),
 	INVALID_PROPOSE_STATUS(HttpStatus.BAD_REQUEST, "PROP4005", "유효하지 않은 제안 상태입니다."),
-	PROPOSE_ALREADY_PAID(HttpStatus.BAD_REQUEST, "PROP4006", "이미 결제된 제안입니다."),
-	PROPOSE_NOT_FOUND(HttpStatus.NOT_FOUND, "PROP4040", "해당 제안이 존재하지 않습니다."),
-	PAYMENT_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "PROP5001", "결제 중 에러가 발생했습니다.");
+	PROPOSE_NOT_FOUND(HttpStatus.NOT_FOUND, "PROP4040", "해당 제안이 존재하지 않습니다.");
 
 	private final HttpStatus httpStatus;
 	private final String code;
diff --git a/api/src/main/resources/application-prod.yml b/api/src/main/resources/application-prod.yml
index a0da6eef..767a31df 100644
--- a/api/src/main/resources/application-prod.yml
+++ b/api/src/main/resources/application-prod.yml
@@ -8,25 +8,7 @@ spring:
       access-expiration-time: ${JWT_ACCESS_EXPIRATION_TIME}
       refresh-expiration-time: ${JWT_REFRESH_EXPIRATION_TIME}
 
-mail:
-  smtp:
-    port: ${EMAIL_PORT}
-    auth: true
-    starttls:
-      required: true
-      enable: true
-    socketFactory:
-      class: javax.net.ssl.SSLSocketFactory
-      fallback: false
-
-AdminMail:
-  id: ${EMAIL_ID}
-  password: ${EMAIL_PASSWORD}
-
 firebase:
   fcmUrl: ${FIREBASE_URL}
   firebaseConfigPath: ${FIREBASE_PATH}
   scope: https://www.googleapis.com/auth/cloud-platform
-
-PORT_ONE_KEY: ${PORT_ONE_KEY}
-PORT_ONE_SECRET: ${PORT_ONE_SECRET}
diff --git a/api/src/main/resources/application.yml b/api/src/main/resources/application.yml
index 91850ab6..3c8d8a08 100644
--- a/api/src/main/resources/application.yml
+++ b/api/src/main/resources/application.yml
@@ -4,8 +4,8 @@ server:
 spring:
   profiles:
     group:
-      "local": "db, s3, secret"
-      "prod": "db, s3, redis"
+      "local": "db, s3, email, portone, secret"
+      "prod": "db, s3, redis, email, portone"
     default: local
 
   servlet:
diff --git a/api/src/main/resources/templates/payment.html b/api/src/main/resources/templates/payment.html
deleted file mode 100644
index 23407b7b..00000000
--- a/api/src/main/resources/templates/payment.html
+++ /dev/null
@@ -1,77 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <style>
-        .payment-button {
-            background-color: #4CAF50; /* 녹색 배경 */
-            border: none;
-            color: white;
-            padding: 15px 32px; /* 위아래 15px, 좌우 32px의 패딩 */
-            text-align: center;
-            text-decoration: none;
-            display: inline-block;
-            font-size: 16px;
-            margin: 4px 2px;
-            cursor: pointer;
-            border-radius: 8px; /* 버튼 모서리 둥글게 */
-            transition-duration: 0.4s; /* 호버 효과 시간 */
-        }
-
-        .payment-button:hover {
-            background-color: white; /* 호버 상태 배경 */
-            color: black; /* 호버 상태 텍스트 색상 */
-            border: 2px solid #4CAF50; /* 호버 상태 테두리 */
-        }
-    </style>
-    <!-- jQuery -->
-    <script type="text/javascript" src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
-    <!-- iamport.payment.js -->
-    <script type="text/javascript" src="https://cdn.iamport.kr/js/iamport.payment-1.2.0.js"></script>
-    <!-- axios -->
-    <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
-    <script>
-        var IMP = window.IMP;
-        IMP.init("imp60728723");
-
-        function requestPay() {
-            IMP.request_pay({
-                    pg: "kakaopay.TC0ONETIME", //Test는 TC0ONETIME
-                    pay_method: "card",
-                    merchant_uid: `payment-${crypto.randomUUID()}`,
-                    name: "스포너스 결제 테스트",
-                    amount: 100000,
-                    buyer_email: 'sponus@test.com',
-                    buyer_name: '스포너스',
-                    buyer_tel: '010-1234-5678',
-                    buyer_addr: '서울특별시',
-                    buyer_postcode: '123-456',
-                },
-                rsp => {
-                    if (rsp.success) {
-                        console.log(rsp);
-                        // axios로 HTTP 요청
-                        // axios({
-                        //     url: "/api/v1/payments", // 가맹점 서버
-                        //     method: "post",
-                        //     headers: {"Content-Type": "application/json"},
-                        //     data: {
-                        //         "impUid": rsp.imp_uid,
-                        //         "merchantUid": rsp.merchant_uid
-                        //     }
-                        // }).then((data) => {
-                        //     alert(`결제가 완료되었습니다.`);
-                        // })
-                    } else {
-                        alert(`결제에 실패하였습니다. 에러 내용: ${rsp.error_msg}`);
-                    }
-                }
-            );
-        }
-    </script>
-    <meta charset="UTF-8">
-    <title>Sample Payment</title>
-</head>
-<body>
-<button class="payment-button" onclick="requestPay()">결제하기</button>
-</body>
-</html>
diff --git a/core/core-infra-email/build.gradle b/core/core-infra-email/build.gradle
new file mode 100644
index 00000000..a87592dd
--- /dev/null
+++ b/core/core-infra-email/build.gradle
@@ -0,0 +1,7 @@
+dependencies {
+    // email
+    implementation 'org.springframework.boot:spring-boot-starter-mail'
+}
+
+bootJar { enabled = false }
+jar { enabled = true }
diff --git a/api/src/main/java/com/sponus/sponusbe/global/config/EmailConfig.java b/core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailConfig.java
similarity index 81%
rename from api/src/main/java/com/sponus/sponusbe/global/config/EmailConfig.java
rename to core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailConfig.java
index 1be3e0b1..a00a329a 100644
--- a/api/src/main/java/com/sponus/sponusbe/global/config/EmailConfig.java
+++ b/core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailConfig.java
@@ -1,4 +1,4 @@
-package com.sponus.sponusbe.global.config;
+package com.sponus.coreinfraemail;
 
 import java.util.Properties;
 
@@ -13,14 +13,15 @@ public class EmailConfig {
 
 	@Value("${mail.smtp.port}")
 	private int port;
-	@Value("${mail.smtp.port}")
-	private int socketPort;
 	@Value("${mail.smtp.auth}")
 	private boolean auth;
 	@Value("${mail.smtp.starttls.enable}")
 	private boolean starttls;
 	@Value("${mail.smtp.starttls.required}")
-	private boolean startlls_required;
+	private boolean startllsRequired;
+
+	@Value("${mail.smtp.socketFactory.class}")
+	private String socketFactory;
 	@Value("${mail.smtp.socketFactory.fallback}")
 	private boolean fallback;
 	@Value("${AdminMail.id}")
@@ -42,12 +43,12 @@ public JavaMailSender javaMailService() {
 
 	private Properties getMailProperties() {
 		Properties pt = new Properties();
-		pt.put("mail.smtp.socketFactory.port", socketPort);
+		pt.put("mail.smtp.socketFactory.port", port);
 		pt.put("mail.smtp.auth", auth);
 		pt.put("mail.smtp.starttls.enable", starttls);
-		pt.put("mail.smtp.starttls.required", startlls_required);
+		pt.put("mail.smtp.starttls.required", startllsRequired);
 		pt.put("mail.smtp.socketFactory.fallback", fallback);
-		pt.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
+		pt.put("mail.smtp.socketFactory.class", socketFactory);
 		return pt;
 	}
 }
diff --git a/core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailUtil.java b/core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailUtil.java
new file mode 100644
index 00000000..8f66d70a
--- /dev/null
+++ b/core/core-infra-email/src/main/java/com/sponus/coreinfraemail/EmailUtil.java
@@ -0,0 +1,76 @@
+package com.sponus.coreinfraemail;
+
+import java.util.Random;
+
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.stereotype.Component;
+
+import jakarta.mail.Message;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+@Component
+@RequiredArgsConstructor
+@Slf4j
+public class EmailUtil {
+
+	private final JavaMailSender emailSender;
+
+	private static final Random RANDOM = new Random();
+
+	public String sendEmail(String to) throws Exception {
+		String code = createEmailCode();
+		MimeMessage message = createEmail(to, code);
+		emailSender.send(message);
+		return code;
+	}
+
+	private MimeMessage createEmail(String to, String code) throws Exception {
+		log.info("보내는 대상 : " + to);
+		log.info("인증 코드 : " + code);
+		MimeMessage message = emailSender.createMimeMessage();
+		InternetAddress[] recipients = {new InternetAddress(to)};
+		message.setRecipients(Message.RecipientType.TO, recipients); // 보내는 대상
+		message.setSubject("Spon-us 인증 코드 발급입니다."); // 제목
+
+		String msgg = "";
+		msgg += "<div style='margin:20px;'>";
+		msgg += "<h1> Spon-us 인증 코드입니다. </h1>"; // 동적으로 메시지 내용 변경
+		msgg += "<br>";
+		msgg += "<div align='center' style='border:1px solid black; font-family:verdana';>";
+		msgg += "<h3 style='color:blue;'> 인증 코드 </h3>";
+		msgg += "<div style='font-size:130%'>";
+		msgg += "인증 코드 : <strong>";
+		msgg += code + "</strong><div><br/> ";
+		msgg += "</div>";
+		message.setText(msgg, "utf-8", "html"); // 내용
+		message.setFrom(new InternetAddress("Spon-us_team", "Spon-us")); // 보내는 사람
+
+		return message;
+	}
+
+	public static String createEmailCode() {
+		StringBuilder code = new StringBuilder();
+
+		for (int i = 0; i < 6; i++) { // 인증 코드 6자리
+			int index = RANDOM.nextInt(3); // 0~2 까지 랜덤
+			switch (index) {
+				case 0:
+					code.append((char)((RANDOM.nextInt(26)) + 97));
+					//  a~z  (ex. 1+97=98 => (char)98 = 'b')
+					break;
+				case 1:
+					code.append((char)((RANDOM.nextInt(26)) + 65));
+					//  A~Z
+					break;
+				default:
+					code.append((RANDOM.nextInt(10)));
+					// 0~9
+					break;
+			}
+		}
+		return code.toString();
+	}
+}
diff --git a/core/core-infra-email/src/main/resources/application-email.yml b/core/core-infra-email/src/main/resources/application-email.yml
new file mode 100644
index 00000000..af8e0cdc
--- /dev/null
+++ b/core/core-infra-email/src/main/resources/application-email.yml
@@ -0,0 +1,14 @@
+mail:
+  smtp:
+    port: ${EMAIL_PORT}
+    auth: true
+    starttls:
+      required: true
+      enable: true
+    socketFactory:
+      class: javax.net.ssl.SSLSocketFactory
+      fallback: false
+
+AdminMail:
+  id: ${EMAIL_ID}
+  password: ${EMAIL_PASSWORD}
diff --git a/core/core-infra-portone/build.gradle b/core/core-infra-portone/build.gradle
new file mode 100644
index 00000000..6e812e69
--- /dev/null
+++ b/core/core-infra-portone/build.gradle
@@ -0,0 +1,13 @@
+dependencies {
+
+    implementation project(':core:core-domain');
+
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
+    // Iamport
+    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+    implementation 'com.github.iamport:iamport-rest-client-java:0.2.23'
+}
+
+bootJar { enabled = false }
+jar { enabled = true }
diff --git a/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentErrorCode.java b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentErrorCode.java
new file mode 100644
index 00000000..55cbc6f3
--- /dev/null
+++ b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentErrorCode.java
@@ -0,0 +1,29 @@
+package com.sponus.coreinfraportone;
+
+import org.springframework.http.HttpStatus;
+
+import com.sponus.coredomain.domain.common.ApiResponse;
+import com.sponus.coredomain.domain.common.BaseErrorCode;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum PaymentErrorCode implements BaseErrorCode {
+	PAYMENT_ERROR(HttpStatus.BAD_REQUEST, "PAY4000", "결제 중 에러가 발생했습니다."),
+
+	PROPOSE_ALREADY_PAID(HttpStatus.BAD_REQUEST, "PAY4001", "이미 결제된 제안입니다."),
+
+	PROPOSE_NOT_FOUND(HttpStatus.NOT_FOUND, "PAY4002", "해당 제안이 존재하지 않습니다."),
+	INVALID_PROPOSED_ORGANIZATION(HttpStatus.BAD_REQUEST, "PAY4003", "제안을 받은 단체만 접근이 가능합니다.");
+
+	private final HttpStatus httpStatus;
+	private final String code;
+	private final String message;
+
+	@Override
+	public ApiResponse<Void> getErrorResponse() {
+		return ApiResponse.onFailure(code, message);
+	}
+}
diff --git a/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentException.java b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentException.java
new file mode 100644
index 00000000..5d5900ef
--- /dev/null
+++ b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentException.java
@@ -0,0 +1,15 @@
+package com.sponus.coreinfraportone;
+
+import com.sponus.coredomain.domain.common.BaseErrorCode;
+
+import lombok.Getter;
+
+@Getter
+public class PaymentException extends RuntimeException {
+
+	private final BaseErrorCode errorCode;
+
+	public PaymentException(BaseErrorCode errorCode) {
+		this.errorCode = errorCode;
+	}
+}
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/payment/dto/PaymentRequest.java b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentRequest.java
similarity index 65%
rename from api/src/main/java/com/sponus/sponusbe/domain/payment/dto/PaymentRequest.java
rename to core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentRequest.java
index 3c29eac9..4032ecb1 100644
--- a/api/src/main/java/com/sponus/sponusbe/domain/payment/dto/PaymentRequest.java
+++ b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentRequest.java
@@ -1,4 +1,4 @@
-package com.sponus.sponusbe.domain.payment.dto;
+package com.sponus.coreinfraportone;
 
 public record PaymentRequest(
 	String impUid,
diff --git a/api/src/main/java/com/sponus/sponusbe/domain/payment/service/PaymentService.java b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentUtil.java
similarity index 77%
rename from api/src/main/java/com/sponus/sponusbe/domain/payment/service/PaymentService.java
rename to core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentUtil.java
index e86626f3..8fd5c210 100644
--- a/api/src/main/java/com/sponus/sponusbe/domain/payment/service/PaymentService.java
+++ b/core/core-infra-portone/src/main/java/com/sponus/coreinfraportone/PaymentUtil.java
@@ -1,9 +1,7 @@
-package com.sponus.sponusbe.domain.payment.service;
+package com.sponus.coreinfraportone;
 
 import java.io.IOException;
 
-import javax.annotation.PostConstruct;
-
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -15,10 +13,8 @@
 import com.sponus.coredomain.domain.organization.Organization;
 import com.sponus.coredomain.domain.propose.Propose;
 import com.sponus.coredomain.domain.propose.repository.ProposeRepository;
-import com.sponus.sponusbe.domain.payment.dto.PaymentRequest;
-import com.sponus.sponusbe.domain.propose.exception.ProposeErrorCode;
-import com.sponus.sponusbe.domain.propose.exception.ProposeException;
 
+import jakarta.annotation.PostConstruct;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
@@ -26,7 +22,7 @@
 @Service
 @Transactional
 @RequiredArgsConstructor
-public class PaymentService {
+public class PaymentUtil {
 
 	@Value("${PORT_ONE_KEY}")
 	private String restApiKey;
@@ -45,12 +41,12 @@ public Payment paymentByImpUid(PaymentRequest request, Organization authOrganiza
 		try {
 			log.info("Payment Request : {}", request.toString());
 			final Propose propose = proposeRepository.findById(request.proposeId())
-				.orElseThrow(() -> new ProposeException(ProposeErrorCode.PROPOSE_NOT_FOUND));
+				.orElseThrow(() -> new PaymentException(PaymentErrorCode.PROPOSE_NOT_FOUND));
 			if (!isProposingOrganization(propose, authOrganization)) {
-				throw new ProposeException(ProposeErrorCode.INVALID_PROPOSING_ORGANIZATION);
+				throw new PaymentException(PaymentErrorCode.INVALID_PROPOSED_ORGANIZATION);
 			}
 			if (propose.isPaid()) {
-				throw new ProposeException(ProposeErrorCode.PROPOSE_ALREADY_PAID);
+				throw new PaymentException(PaymentErrorCode.PROPOSE_ALREADY_PAID);
 			}
 			propose.updateToPaid(request.impUid());
 			final IamportResponse<Payment> paymentIamportResponse = iamportClient.paymentByImpUid(request.impUid());
@@ -58,7 +54,7 @@ public Payment paymentByImpUid(PaymentRequest request, Organization authOrganiza
 			return paymentIamportResponse.getResponse();
 		} catch (IamportResponseException | IOException e) {
 			log.error("Payment Error : {}", e.getMessage());
-			throw new ProposeException(ProposeErrorCode.PAYMENT_ERROR);
+			throw new PaymentException(PaymentErrorCode.PAYMENT_ERROR);
 		}
 	}
 
diff --git a/core/core-infra-portone/src/main/resources/application-portone.yml b/core/core-infra-portone/src/main/resources/application-portone.yml
new file mode 100644
index 00000000..77e26fcf
--- /dev/null
+++ b/core/core-infra-portone/src/main/resources/application-portone.yml
@@ -0,0 +1,2 @@
+PORT_ONE_KEY: ${PORT_ONE_KEY}
+PORT_ONE_SECRET: ${PORT_ONE_SECRET}
diff --git a/api/out/production/resources/templates/payment.html b/core/core-infra-portone/src/main/resources/templates/payment.html
similarity index 100%
rename from api/out/production/resources/templates/payment.html
rename to core/core-infra-portone/src/main/resources/templates/payment.html
diff --git a/settings.gradle b/settings.gradle
index 4c44e610..b420afa4 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -4,3 +4,5 @@ include 'core:core-domain'
 include 'core:core-infra-db'
 include 'core:core-infra-s3'
 include 'core:core-infra-redis'
+include 'core:core-infra-email'
+include 'core:core-infra-portone'