diff --git a/Example/Podfile b/Example/Podfile
index ebed895..7b43f3d 100644
--- a/Example/Podfile
+++ b/Example/Podfile
@@ -29,7 +29,7 @@ target 'iamport-ios_Example' do
   # cocoapods 사용시 enable
   # cocoapods 사용시 enable
   # pod 'iamport-ios', :path => '../' # local
-  # pod 'iamport-ios', '~> 1.4.1' # remote
+  # pod 'iamport-ios', '~> 1.4.2' # remote
   # cocoapods 사용시 enable
   # cocoapods 사용시 enable
 
diff --git a/README.md b/README.md
index c14bfb3..d4e2766 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ it, simply add the following line to your Podfile:
 
 - cocoapods 이용시 (RxSwift 5.x 사용)
 ```ruby
-pod 'iamport-ios', '~> 1.4.1'
+pod 'iamport-ios', '~> 1.4.2'
 ```
 
 
diff --git a/Sources/PrivacyInfo.xcprivacy b/Sources/PrivacyInfo.xcprivacy
new file mode 100644
index 0000000..3fea02e
--- /dev/null
+++ b/Sources/PrivacyInfo.xcprivacy
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSPrivacyTracking</key>
+	<false/>
+	<key>NSPrivacyAccessedAPITypes</key>
+	<array>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryDiskSpace</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>E174.1</string>
+			</array>
+		</dict>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryUserDefaults</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>CA92.1</string>
+			</array>
+		</dict>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>C617.1</string>
+			</array>
+		</dict>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategorySystemBootTime</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>35F9.1</string>
+			</array>
+		</dict>
+	</array>
+</dict>
+</plist>
diff --git a/Sources/iamport-ios/Classes/Presentation/IamportWebViewMode.swift b/Sources/iamport-ios/Classes/Presentation/IamportWebViewMode.swift
index f044820..a0bf722 100644
--- a/Sources/iamport-ios/Classes/Presentation/IamportWebViewMode.swift
+++ b/Sources/iamport-ios/Classes/Presentation/IamportWebViewMode.swift
@@ -355,24 +355,19 @@ extension IamportWebViewMode: WKScriptMessageHandler {
             case .START_WORKING_SDK:
                 print("JS SDK 통한 결제 시작 요청")
 
-                guard let pay = request else {
+                guard let request = request else {
                     print(".START_WORKING_SDK payment 를 찾을 수 없음")
                     return
                 }
-                debug_dump(pay)
+                debug_dump(request)
 
-                let encoder = JSONEncoder()
+                initSDK(userCode: request.userCode, tierCode: request.tierCode)
 
-                initSDK(userCode: pay.userCode, tierCode: pay.tierCode)
-
-                switch pay.payload {
-                case let .payment(payload):
-                    let jsonData = try? encoder.encode(payload)
-                    requestPay(payloadJsonData: jsonData)
-
-                case let .certification(payload):
-                    let jsonData = try? encoder.encode(payload)
-                    requestCertification(payloadJsonData: jsonData)
+                switch request.payload {
+                case let .payment(payment):
+                    requestPay(payment: payment)
+                case let .certification(certification):
+                    requestCertification(certification: certification)
                 }
 
             case .RECEIVED:
@@ -408,20 +403,38 @@ extension IamportWebViewMode: WKScriptMessageHandler {
         evaluateJavaScript(method: jsInitMethod)
     }
 
-    private func requestPay(payloadJsonData: Data?) {
-        guard let json = payloadJsonData, let request = String(data: json, encoding: .utf8)?.replacingOccurrences(of: "'", with: "\\'") else {
-            print("Failed to encode payload for `requestPay`")
+    private func requestPay(payment: IamportPayment) {
+        guard let requestJsonData = try? JSONEncoder().encode(payment) else {
+            print("requestPay :: payment 데이터를 JSONEncoder encode 할 수 없습니다.")
             return
         }
-        debug_log("payment request : '\(request)'")
-        evaluateJavaScript(method: "requestPay('\(request)');")
+        
+        guard let requestPayload = String(data: requestJsonData, encoding: .utf8)?.replacingOccurrences(of: "'", with: "\\'")
+            else {
+            print("requestPayWithCustomData :: requestJsonData 을 String 화 할 수 없습니다.")
+            return
+        }
+        
+        if let encodedCustomData = payment.custom_data?.getBase64Encode() {
+            debug_log("requestPayWithCustomData request : '\(requestPayload)', encodedCustomData : '\(encodedCustomData)'")
+            evaluateJavaScript(method: "requestPayWithCustomData('\(requestPayload)', '\(encodedCustomData)');")
+        } else {
+            debug_log("requestPay request : '\(requestPayload)'")
+            evaluateJavaScript(method: "requestPay('\(requestPayload)');")
+        }
     }
 
-    private func requestCertification(payloadJsonData: Data?) {
-        guard let json = payloadJsonData, let request = String(data: json, encoding: .utf8)?.replacingOccurrences(of: "'", with: "\\'") else {
-            print("Failed to encode payload for `requestCertification`")
+    private func requestCertification(certification: IamportCertification) {
+        guard let certificationJsonData = try? JSONEncoder().encode(certification) else {
+            print("requestCertification :: certification 데이터를 JSONEncoder encode 할 수 없습니다.")
+            return
+        }
+
+        guard let request = String(data: certificationJsonData, encoding: .utf8)?.replacingOccurrences(of: "'", with: "\\'") else {
+            print("requestCertification :: certificationJsonData를 String으로 변환할 수 없습니다.")
             return
         }
+        
         debug_log("certification request : '\(request)'")
         evaluateJavaScript(method: "certification('\(request)');")
     }
diff --git a/iamport-ios.podspec b/iamport-ios.podspec
index ca5f387..bdd5267 100644
--- a/iamport-ios.podspec
+++ b/iamport-ios.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'iamport-ios'
-  s.version          = '1.4.1'
+  s.version          = '1.4.2'
   s.summary          = 'iamport-ios will help develop for your iOS App payments'
 
 # This description is used to generate tags and improve search results.