diff --git a/js/certify.js b/js/certify.js
index 616760c72..d98c59785 100644
--- a/js/certify.js
+++ b/js/certify.js
@@ -22,10 +22,14 @@ function certify_win_open(type, url)
             if($("#kcp_cert").size() < 1) {
                 $frm.wrap('<div id="cert_info"></div>');
 
-                $("#cert_info").append('<form name="form_temp" method="post">')
-                               .after('<iframe id="kcp_cert" name="kcp_cert" width="100%" height="700" frameborder="0" scrolling="no" style="display:none"></iframe>');
+                $("#cert_info").append('<form name="form_temp" method="post">');
+            } else {
+                $("#kcp_cert").remove();
             }
 
+            $("#cert_info")
+                .after('<iframe id="kcp_cert" name="kcp_cert" width="100%" height="700" frameborder="0" scrolling="no" style="display:none"></iframe>');
+
             var temp_form = document.form_temp;
             temp_form.target = "kcp_cert";
             temp_form.action = url;
@@ -51,8 +55,36 @@ function certify_win_open(type, url)
     }
     else if(type == 'lg-hp')
     {
-        var popupWindow = window.open( url, "auth_popup", "left=200, top=100, width=400, height=400, scrollbar=yes" );
-        popupWindow.focus();
+
+        if( g5_is_mobile )
+        {
+            var $frm = $(event.target.form),
+                lgu_cert = "lgu_cert";
+
+            if($("#lgu_cert").size() < 1) {
+                $frm.wrap('<div id="cert_info"></div>');
+
+                $("#cert_info").append('<form name="form_temp" method="post">');
+            } else {
+                $("#"+lgu_cert).remove();
+            }
+
+            $("#cert_info")
+                .after('<iframe id="'+lgu_cert+'" name="lgu_cert" width="100%" src="'+url+'" height="700" frameborder="0" scrolling="no" style="display:none"></iframe>');
+
+            document.getElementById( "cert_info" ).style.display = "none";
+            document.getElementById( lgu_cert  ).style.display = "";
+
+        } else {
+            var width= 640;
+            var height = 660;
+
+            var leftpos = screen.width  / 2 - ( width  / 2 );
+            var toppos  = screen.height / 2 - ( height / 2 );
+
+            var popupWindow = window.open( url, "auth_popup", "left=" + leftpos + ", top="    + toppos + ", width=" + width   + ", height=" + height + ", scrollbar=yes" );
+            popupWindow.focus();
+        }
     }
 }
 
diff --git a/mobile/skin/member/basic/register_form.skin.php b/mobile/skin/member/basic/register_form.skin.php
index db17e0fa2..595c0bfb2 100644
--- a/mobile/skin/member/basic/register_form.skin.php
+++ b/mobile/skin/member/basic/register_form.skin.php
@@ -60,7 +60,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                 if($config['cf_cert_use']) {
                     if($config['cf_cert_ipin'])
                         echo '<button type="button" id="win_ipin_cert" class="btn_frmline">아이핀 본인확인</button>'.PHP_EOL;
-                    if($config['cf_cert_hp'] && $config['cf_cert_hp'] != 'lg')
+                    if($config['cf_cert_hp'])
                         echo '<button type="button" id="win_hp_cert" class="btn_frmline">휴대폰 본인확인</button>'.PHP_EOL;
 
                     echo '<noscript>본인확인을 위해서는 자바스크립트 사용이 가능해야합니다.</noscript>'.PHP_EOL;
@@ -288,6 +288,10 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                     $cert_url = G5_KCPCERT_URL.'/kcpcert_form.php';
                     $cert_type = 'kcp-hp';
                     break;
+                case 'lg':
+                    $cert_url = G5_LGXPAY_URL.'/AuthOnlyReq.php';
+                    $cert_type = 'lg-hp';
+                    break;
                 default:
                     echo 'alert("기본환경설정에서 휴대폰 본인확인 설정을 해주십시오");';
                     echo 'return false;';
diff --git a/plugin/kcpcert/kcpcert_result.php b/plugin/kcpcert/kcpcert_result.php
index 5eaab75ab..031942fa9 100644
--- a/plugin/kcpcert/kcpcert_result.php
+++ b/plugin/kcpcert/kcpcert_result.php
@@ -173,7 +173,14 @@ if( $cert_enc_use == "Y" )
 else if( $cert_enc_use != "Y" )
 {
     // 암호화 인증 안함
-    alert_close("휴대폰 본인확인을 취소 하셨습니다.");
+    if( G5_IS_MOBILE ){
+        echo '<script>'.PHP_EOL;
+        echo 'window.parent.$("#cert_info").css("display", "");'.PHP_EOL;
+        echo 'window.parent.$("#kcp_cert" ).css("display", "none");'.PHP_EOL;
+        echo '</script>'.PHP_EOL;
+    } else {
+        alert_close("휴대폰 본인확인을 취소 하셨습니다.");
+    }
     exit;
 }
 
diff --git a/plugin/lgxpay/AuthOnlyReq.php b/plugin/lgxpay/AuthOnlyReq.php
index 476b78ac7..9f08230d2 100644
--- a/plugin/lgxpay/AuthOnlyReq.php
+++ b/plugin/lgxpay/AuthOnlyReq.php
@@ -46,6 +46,45 @@ $LGD_CUSTOM_SKIN            = 'red';                            // 상점정의
 
 $LGD_MERTKEY    = $config['cf_lg_mert_key'];
 $LGD_HASHDATA   = md5($LGD_MID.$LGD_BUYERSSN.$LGD_TIMESTAMP.$LGD_MERTKEY);
+$LGD_RETURNURL  = G5_PLUGIN_URL.'/lgxpay/returnurl.php';
+if( G5_IS_MOBILE ){
+    $LGD_WINDOW_TYPE = 'submit';
+} else {
+    $LGD_WINDOW_TYPE = 'iframe';
+}
+
+$LGD_NAMECHECKYN = 'N';
+$LGD_HOLDCHECKYN = 'Y';
+$LGD_CUSTOM_USABLEPAY = 'ASC007';
+
+$payReqMap = array();
+
+$payReqMap['CST_PLATFORM']              = $CST_PLATFORM;           				// 테스트, 서비스 구분
+$payReqMap['CST_MID']                   = $CST_MID;                				// 상점아이디
+$payReqMap['LGD_MID']                   = $LGD_MID;                				// 상점아이디
+$payReqMap['LGD_HASHDATA'] 				= $LGD_HASHDATA;      	           		// MD5 해쉬암호값
+$payReqMap['LGD_BUYER']              	= $LGD_BUYER;							// 요청자 성명
+$payReqMap['LGD_BUYERSSN']              = $LGD_BUYERSSN;           				// 요청자 생년월일 / 사업자번호
+
+$payReqMap['LGD_NAMECHECKYN']           = $LGD_NAMECHECKYN;           			// 계좌실명확인여부
+$payReqMap['LGD_HOLDCHECKYN']           = $LGD_HOLDCHECKYN;           			// 휴대폰본인확인 SMS발송 여부
+$payReqMap['LGD_MOBILE_SUBAUTH_SITECD'] = $LGD_MOBILE_SUBAUTH_SITECD;           // 신용평가사에서 부여받은 회원사 고유 코드
+
+$payReqMap['LGD_CUSTOM_SKIN'] 			= $LGD_CUSTOM_SKIN;                		// 본인확인창 SKIN
+$payReqMap['LGD_TIMESTAMP'] 			= $LGD_TIMESTAMP;                  		// 타임스탬프
+$payReqMap['LGD_CUSTOM_USABLEPAY']      = $LGD_CUSTOM_USABLEPAY;        		// [반드시 설정]상점정의 이용가능 인증수단으로 한 개의 값만 설정 (예:"ASC007")
+$payReqMap['LGD_WINDOW_TYPE']           = $LGD_WINDOW_TYPE;        				// 호출방식 (수정불가)
+$payReqMap['LGD_RETURNURL'] 			= $LGD_RETURNURL;      			   		// 응답수신페이지
+$payReqMap['LGD_VERSION'] 				= "PHP_Non-ActiveX_AuthOnly";			// 사용타입 정보(수정 및 삭제 금지): 이 정보를 근거로 어떤 서비스를 사용하는지 판단할 수 있습니다.
+ 
+
+/*Return URL에서 인증 결과 수신 시 셋팅될 파라미터 입니다.*/
+$payReqMap['LGD_RESPCODE'] 				= "";
+$payReqMap['LGD_RESPMSG'] 				= "";
+$payReqMap['LGD_AUTHONLYKEY'] 			= "";
+$payReqMap['LGD_PAYTYPE'] 				= "";
+
+$_SESSION['lgd_certify'] = $payReqMap;
 
 /*
  *************************************************
@@ -61,25 +100,54 @@ $LGD_HASHDATA   = md5($LGD_MID.$LGD_BUYERSSN.$LGD_TIMESTAMP.$LGD_MERTKEY);
 <title>LG유플러스 전자결제 본인확인서비스</title>
 <!-- 고객사 사이트가 https인 경우는 아래 http://을 https:// 으로 변경하시면 됩니다. -->
 <link rel="stylesheet" href="<?php echo G5_CSS_URL;?>/default.css">
-<script language="javascript" src="//xpay.uplus.co.kr/xpay/js/xpay_authonly.js" type="text/javascript" charset="EUC-KR"></script>
-<script>
-function do_Authonly() {
-    ret = xpay_authonly_check(document.getElementById("LGD_PAYINFO"), document.getElementById("CST_PLATFORM").value);
-    if (ret == "00"){     //ActiveX 로딩 성공
-        if(dpop.getData("LGD_RESPCODE") == "0000"){
-            document.getElementById("LGD_AUTHONLYKEY").value = dpop.getData("LGD_AUTHONLYKEY");
-            document.getElementById("LGD_PAYTYPE").value = dpop.getData("LGD_PAYTYPE");
-            //alert("인증요청을 합니다.");
-            document.getElementById("LGD_PAYINFO").submit();
-        } else {
-            alert(dpop.getData("LGD_RESPMSG"));
-        }
-    } else {
-        alert("LG유플러스 본인확인서비스를 위한 ActiveX 설치 실패\nInternet Explorer 외의 브라우저에서는 사용할 수 없습니다.");
-        //window.close();
-    }
-}
+<script language="javascript" src="<?php echo (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on') ? 'https' : 'http'; ?>://xpay.uplus.co.kr/xpay/js/xpay_crossplatform.js" type="text/javascript"></script>
+
+<script type="text/javascript">
+
+	/*
+	* 수정불가.
+	*/
+	var LGD_window_type = "<?php echo $LGD_WINDOW_TYPE;?>";
+	var lgd_form = "LGD_PAYINFO";
+	/*
+	* 수정불가.
+	*/
+	function launchCrossPlatform(){
+		
+        <?php if( G5_IS_MOBILE ){   //모바일이면 ?>
+            lgdwin = open_paymentwindow(document.getElementById(lgd_form), '<?php echo $CST_PLATFORM ?>', LGD_window_type);
+        <?php } else {  //PC 이면 ?>
+		    lgdwin = openAuthonly( document.getElementById(lgd_form), "<?php echo $CST_PLATFORM; ?>", LGD_window_type, null );
+        <?php } ?>
+
+	}
+	
+	/*
+	* FORM 명만  수정 가능
+	*/
+	function getFormObject() {
+	        return document.getElementById(lgd_form);
+	}
+	
+	function  payment_return() {
+		
+		var fDoc = lgdwin.contentWindow || lgdwin.contentDocument;
+	
+		if (fDoc.document.getElementById('LGD_RESPCODE').value == "0000") {
+			document.getElementById("LGD_AUTHONLYKEY").value = fDoc.document.getElementById('LGD_AUTHONLYKEY').value;
+			document.getElementById("LGD_PAYTYPE").value = fDoc.document.getElementById('LGD_PAYTYPE').value;
+			
+			document.getElementById(lgd_form).target = "_self";
+            document.getElementById("LGD_PAYINFO").action = "AuthOnlyRes.php";
+			document.getElementById(lgd_form).submit();
+		} else {
+			alert("LGD_RESPCODE (결과코드2) : " + fDoc.document.getElementById('LGD_RESPCODE').value + "\n" + "LGD_RESPMSG (결과메시지): " + fDoc.document.getElementById('LGD_RESPMSG').value);
+			closeIframe();
+            window.close();
+		}//end if
+	}//end payment_return
 </script>
+
 <style>
 #uplus_win {}
 .up_cmt {text-align:center; font-size:14px;}
@@ -92,22 +160,15 @@ function do_Authonly() {
 </style>
 </head>
 <body>
-<form method="post" id="LGD_PAYINFO" action="<?php echo G5_LGXPAY_URL; ?>/AuthOnlyRes.php">
-<input type="hidden" name="CST_MID" id="CST_MID" value="<?php echo $CST_MID; ?>" />
-<input type="hidden" name="LGD_MID" id="LGD_MID" value="<?php echo $LGD_MID; ?>"/>
-<input type="hidden" name="CST_PLATFORM" id="CST_PLATFORM" value="<?php echo $CST_PLATFORM; ?>"/>
-<input type="hidden" name="LGD_BUYERSSN" value="<?php echo $LGD_BUYERSSN; ?>"/>
-<input type="hidden" name="LGD_BUYER" value="<?php echo $LGD_BUYER; ?>"/>
-<input type="hidden" name="LGD_MOBILE_SUBAUTH_SITECD" value="<?php echo  $LGD_MOBILE_SUBAUTH_SITECD; ?>"/>
-<input type="hidden" name="LGD_TIMESTAMP" value="<?php echo $LGD_TIMESTAMP; ?>"/>
-<input type="hidden" name="LGD_HASHDATA" value="<?php echo $LGD_HASHDATA; ?>"/>
-<input type="hidden" name="LGD_NAMECHECKYN" value="N">
-<input type="hidden" name="LGD_HOLDCHECKYN" value="Y">
-<input type="hidden" name="LGD_CUSTOM_SKIN" value="red">
-<input type="hidden" name="LGD_CUSTOM_FIRSTPAY" value="ASC007">
-<input type="hidden" name="LGD_CUSTOM_USABLEPAY" value="ASC007">
-<input type="hidden" name="LGD_PAYTYPE" id="LGD_PAYTYPE"/>
-<input type="hidden" name="LGD_AUTHONLYKEY" id="LGD_AUTHONLYKEY"/>
+
+<form method="post" name ="LGD_PAYINFO" id="LGD_PAYINFO" action="<?php echo G5_LGXPAY_URL; ?>/AuthOnlyRes.php">
+<input type="hidden" name="LGD_ENCODING" value="UTF-8"/>
+<?php
+foreach ($payReqMap as $key => $value) {
+    echo "<input type='hidden' name='$key' id='$key' value='$value'/>".PHP_EOL;
+}
+?>
+
 </form>
 
 <div id="uplus_win" class="new_win mbskin">
@@ -123,7 +184,7 @@ function do_Authonly() {
     </div>
 </div>
 <script>
-setTimeout("do_Authonly();",300);
+setTimeout("launchCrossPlatform();", 1);
 </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/plugin/lgxpay/AuthOnlyRes.php b/plugin/lgxpay/AuthOnlyRes.php
index 96b7256d6..df5baea1f 100644
--- a/plugin/lgxpay/AuthOnlyRes.php
+++ b/plugin/lgxpay/AuthOnlyRes.php
@@ -156,7 +156,15 @@ if ($xpay->TX()) {
         //인증요청 결과 실패 DB처리
         //echo "인증요청 결과 실패 DB처리하시기 바랍니다.<br>";
 
-        alert_close('인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg());
+        if( G5_IS_MOBILE ){
+            echo '<script>'.PHP_EOL;
+            echo 'window.parent.$("#cert_info").css("display", "");'.PHP_EOL;
+            echo 'window.parent.$("#lgu_cert" ).css("display", "none");'.PHP_EOL;
+            echo 'alert("인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg().'")';
+            echo '</script>'.PHP_EOL;
+        } else {
+            alert_close('인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg());
+        }
         exit;
     }
 } else {
@@ -170,14 +178,31 @@ if ($xpay->TX()) {
     echo "인증요청 결과 실패 DB처리하시기 바랍니다.<br>";
     */
 
-    alert_close('인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg());
+    if( G5_IS_MOBILE ){
+        echo '<script>'.PHP_EOL;
+        echo 'window.parent.$("#cert_info").css("display", "");'.PHP_EOL;
+        echo 'window.parent.$("#lgu_cert" ).css("display", "none");'.PHP_EOL;
+        echo 'alert("인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg().'")';
+        echo '</script>'.PHP_EOL;
+    } else {
+        alert_close('인증요청이 실패하였습니다.\\n\\n코드 : '.$xpay->Response_Code().'  '.$xpay->Response_Msg());
+    }
     exit;
 }
 ?>
 
 <script>
-$(function() {
+jQuery(function($) {
+    
     var $opener = window.opener;
+    var is_mobile = false;
+
+    if (typeof g5_is_mobile != "undefined" && g5_is_mobile ) {
+        $opener = window.parent;
+        is_mobile = true;
+    } else {
+        $opener = window.opener;
+    }
 
     // 인증정보
     $opener.$("input[name=cert_type]").val("<?php echo $cert_type; ?>");
@@ -185,6 +210,11 @@ $(function() {
     $opener.$("input[name=mb_hp]").val("<?php echo $phone_no; ?>").attr("readonly", true);
     $opener.$("input[name=cert_no]").val("<?php echo $md5_cert_no; ?>");
 
+    if(is_mobile) {
+        $opener.$("#cert_info").css("display", "");
+        $opener.$("#lgu_cert" ).css("display", "none");
+    }
+
     alert("본인의 휴대폰번호로 확인 되었습니다.");
     window.close();
 });
@@ -192,4 +222,4 @@ $(function() {
 
 <?php
 include_once(G5_PATH.'/tail.sub.php');
-?>
+?>
\ No newline at end of file
diff --git a/plugin/lgxpay/returnurl.php b/plugin/lgxpay/returnurl.php
new file mode 100644
index 000000000..e0cd0a37b
--- /dev/null
+++ b/plugin/lgxpay/returnurl.php
@@ -0,0 +1,65 @@
+<?php
+include_once('./_common.php');
+
+/*
+  payreq_crossplatform 에서 세션에 저장했던 파라미터 값이 유효한지 체크
+  세션 유지 시간(로그인 유지시간)을 적당히 유지 하거나 세션을 사용하지 않는 경우 DB처리 하시기 바랍니다.
+*/
+if(!isset($_SESSION['lgd_certify'])){
+    echo '세션이 만료 되었거나 유효하지 않은 요청 입니다.';
+    return;
+}
+
+$payReqMap = $_SESSION['lgd_certify'];//결제 요청시, Session에 저장했던 파라미터 MAP
+?>
+<html>
+<head>
+	<script type="text/javascript">
+
+		function setLGDResult() {
+                
+                <?php if ( G5_IS_MOBILE ) {  // 모바일이면 ?>
+                
+                var lgd_form = document.getElementById('LGD_RETURNINFO');
+                
+                lgd_form.action = "AuthOnlyRes.php";
+                lgd_form.submit();
+
+                <?php } else {  // PC 이면 ?>
+                parent.payment_return();
+                <?php } ?>
+			try {
+			} catch (e) {
+				alert(e.message);
+			}
+		}
+
+	</script>
+</head>
+<body onload="setLGDResult()">
+<?php
+  $LGD_RESPCODE = $_POST['LGD_RESPCODE'];
+  $LGD_RESPMSG 	= iconv("EUC-KR","UTF-8",$_POST['LGD_RESPMSG']);
+  $LGD_AUTHONLYKEY		= "";	
+  $LGD_PAYTYPE			= "";
+
+  $payReqMap['LGD_RESPCODE'] = $LGD_RESPCODE;
+  $payReqMap['LGD_RESPMSG']	 = $LGD_RESPMSG;
+
+  if($LGD_RESPCODE == "0000"){
+	  $payReqMap['LGD_AUTHONLYKEY'] = isset($_POST['LGD_AUTHONLYKEY']) ? $_POST['LGD_AUTHONLYKEY'] : '';
+	  $payReqMap['LGD_PAYTYPE'] 	= isset($_POST['LGD_PAYTYPE']) ? $_POST['LGD_PAYTYPE'] : '';
+  }
+  else{
+	  echo "LGD_RESPCODE:" + $LGD_RESPCODE + " ,LGD_RESPMSG:" + $LGD_RESPMSG; //인증 실패에 대한 처리 로직 추가
+  }
+?>
+<form method="post" name="LGD_RETURNINFO" id="LGD_RETURNINFO">
+<?php
+	  foreach ($payReqMap as $key => $value) {
+      echo "<input type='hidden' name='$key' id='$key' value='$value'>";
+    }
+?>
+</form>
+</body>
+</html>
\ No newline at end of file
diff --git a/theme/basic/mobile/skin/member/basic/register_form.skin.php b/theme/basic/mobile/skin/member/basic/register_form.skin.php
index db17e0fa2..595c0bfb2 100644
--- a/theme/basic/mobile/skin/member/basic/register_form.skin.php
+++ b/theme/basic/mobile/skin/member/basic/register_form.skin.php
@@ -60,7 +60,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                 if($config['cf_cert_use']) {
                     if($config['cf_cert_ipin'])
                         echo '<button type="button" id="win_ipin_cert" class="btn_frmline">아이핀 본인확인</button>'.PHP_EOL;
-                    if($config['cf_cert_hp'] && $config['cf_cert_hp'] != 'lg')
+                    if($config['cf_cert_hp'])
                         echo '<button type="button" id="win_hp_cert" class="btn_frmline">휴대폰 본인확인</button>'.PHP_EOL;
 
                     echo '<noscript>본인확인을 위해서는 자바스크립트 사용이 가능해야합니다.</noscript>'.PHP_EOL;
@@ -288,6 +288,10 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                     $cert_url = G5_KCPCERT_URL.'/kcpcert_form.php';
                     $cert_type = 'kcp-hp';
                     break;
+                case 'lg':
+                    $cert_url = G5_LGXPAY_URL.'/AuthOnlyReq.php';
+                    $cert_type = 'lg-hp';
+                    break;
                 default:
                     echo 'alert("기본환경설정에서 휴대폰 본인확인 설정을 해주십시오");';
                     echo 'return false;';