diff --git a/app/Http/Controllers/Api/Admin/Barobill/BarobillKakaotalkController.php b/app/Http/Controllers/Api/Admin/Barobill/BarobillKakaotalkController.php
index 6b2216ec..dae9a3cf 100644
--- a/app/Http/Controllers/Api/Admin/Barobill/BarobillKakaotalkController.php
+++ b/app/Http/Controllers/Api/Admin/Barobill/BarobillKakaotalkController.php
@@ -7,7 +7,6 @@
 use App\Services\Barobill\BarobillService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
-use Illuminate\Support\Facades\Log;
 
 class BarobillKakaotalkController extends Controller
 {
@@ -23,7 +22,7 @@ private function resolveMember(): BarobillMember|JsonResponse
         $tenantId = session('selected_tenant_id', 1);
         $member = BarobillMember::where('tenant_id', $tenantId)->first();
 
-        if (!$member) {
+        if (! $member) {
             return response()->json([
                 'success' => false,
                 'message' => '바로빌 회원사가 등록되어 있지 않습니다.',
@@ -45,11 +44,13 @@ private function resolveMember(): BarobillMember|JsonResponse
     public function getChannels(): JsonResponse
     {
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getKakaotalkChannels($member->biz_no);
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -62,14 +63,16 @@ public function getChannels(): JsonResponse
     public function getChannelManagementUrl(): JsonResponse
     {
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getKakaotalkChannelManagementUrl(
             $member->biz_no,
             $member->barobill_id
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -90,14 +93,16 @@ public function getTemplates(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getKakaotalkTemplates(
             $member->biz_no,
             $request->input('channel_id')
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -110,14 +115,16 @@ public function getTemplates(Request $request): JsonResponse
     public function getTemplateManagementUrl(): JsonResponse
     {
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getKakaotalkTemplateManagementUrl(
             $member->biz_no,
             $member->barobill_id
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -151,41 +158,48 @@ public function sendAlimtalk(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $buttons = $validated['buttons'] ?? [];
+        // sender_id 폼 필드는 채널 ID (예: @codebridge-x)
+        // SenderID는 바로빌 계정 ID, YellowId는 카카오톡 채널 ID
+        $yellowId = $validated['sender_id'];
 
         // 버튼이 있으면 Ex 버전 사용
-        if (!empty($buttons)) {
+        if (! empty($buttons)) {
             $result = $this->barobillService->sendATKakaotalkEx(
-                $member->biz_no,
-                $validated['sender_id'],
-                $validated['template_name'],
-                $validated['receiver_name'],
-                $validated['receiver_num'],
-                $validated['title'] ?? '',
-                $validated['message'],
-                $buttons,
-                $validated['sms_message'] ?? '',
-                $validated['sms_subject'] ?? '',
-                $validated['reserve_dt'] ?? ''
+                corpNum: $member->biz_no,
+                senderId: $member->barobill_id,
+                yellowId: $yellowId,
+                templateName: $validated['template_name'],
+                receiverName: $validated['receiver_name'],
+                receiverNum: $validated['receiver_num'],
+                title: $validated['title'] ?? '',
+                message: $validated['message'],
+                buttons: $buttons,
+                smsMessage: $validated['sms_message'] ?? '',
+                smsSubject: $validated['sms_subject'] ?? '',
+                reserveDT: $validated['reserve_dt'] ?? ''
             );
         } else {
             $result = $this->barobillService->sendATKakaotalk(
-                $member->biz_no,
-                $validated['sender_id'],
-                $validated['template_name'],
-                $validated['receiver_name'],
-                $validated['receiver_num'],
-                $validated['title'] ?? '',
-                $validated['message'],
-                $validated['sms_message'] ?? '',
-                $validated['sms_subject'] ?? '',
-                $validated['reserve_dt'] ?? ''
+                corpNum: $member->biz_no,
+                senderId: $member->barobill_id,
+                yellowId: $yellowId,
+                templateName: $validated['template_name'],
+                receiverName: $validated['receiver_name'],
+                receiverNum: $validated['receiver_num'],
+                title: $validated['title'] ?? '',
+                message: $validated['message'],
+                smsMessage: $validated['sms_message'] ?? '',
+                smsSubject: $validated['sms_subject'] ?? '',
+                reserveDT: $validated['reserve_dt'] ?? ''
             );
         }
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -211,17 +225,20 @@ public function sendAlimtalkBulk(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->sendATKakaotalks(
-            $member->biz_no,
-            $validated['sender_id'],
-            $validated['template_name'],
-            $validated['messages'],
-            $validated['reserve_dt'] ?? ''
+            corpNum: $member->biz_no,
+            senderId: $member->barobill_id,
+            yellowId: $validated['sender_id'],
+            templateName: $validated['template_name'],
+            messages: $validated['messages'],
+            reserveDT: $validated['reserve_dt'] ?? ''
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -255,7 +272,9 @@ public function sendFriendtalk(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->sendFTKakaotalk(
             $member->biz_no,
@@ -271,7 +290,7 @@ public function sendFriendtalk(Request $request): JsonResponse
             $validated['reserve_dt'] ?? ''
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -298,7 +317,9 @@ public function sendFriendtalkImage(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->sendFIKakaotalk(
             $member->biz_no,
@@ -315,7 +336,7 @@ public function sendFriendtalkImage(Request $request): JsonResponse
             $validated['reserve_dt'] ?? ''
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -342,7 +363,9 @@ public function sendFriendtalkWide(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->sendFWKakaotalk(
             $member->biz_no,
@@ -359,7 +382,7 @@ public function sendFriendtalkWide(Request $request): JsonResponse
             $validated['reserve_dt'] ?? ''
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -376,11 +399,13 @@ public function sendFriendtalkWide(Request $request): JsonResponse
     public function getSendResult(string $sendKey): JsonResponse
     {
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getSendKakaotalk($member->biz_no, $sendKey);
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -398,14 +423,16 @@ public function getSendResults(Request $request): JsonResponse
         ]);
 
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->getSendKakaotalks(
             $member->biz_no,
             $validated['send_keys']
         );
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
@@ -422,11 +449,13 @@ public function getSendResults(Request $request): JsonResponse
     public function cancelReserved(string $sendKey): JsonResponse
     {
         $member = $this->resolveMember();
-        if ($member instanceof JsonResponse) return $member;
+        if ($member instanceof JsonResponse) {
+            return $member;
+        }
 
         $result = $this->barobillService->cancelReservedKakaotalk($member->biz_no, $sendKey);
 
-        if (!$result['success']) {
+        if (! $result['success']) {
             return response()->json($result, 422);
         }
 
diff --git a/app/Http/Controllers/ESign/EsignApiController.php b/app/Http/Controllers/ESign/EsignApiController.php
index fc334a8e..0c84814e 100644
--- a/app/Http/Controllers/ESign/EsignApiController.php
+++ b/app/Http/Controllers/ESign/EsignApiController.php
@@ -970,9 +970,9 @@ private function sendAlimtalk(
             $barobill = app(BarobillService::class);
             $barobill->setServerMode($member->server_mode ?? 'production');
 
-            // 카카오톡 채널 목록에서 발신프로필 키(SenderID) 조회
-            $senderId = $this->getKakaotalkSenderId($barobill, $member->biz_no);
-            if (! $senderId) {
+            // 카카오톡 채널 ID 조회 (YellowId로 사용)
+            $channelId = $this->getKakaotalkChannelId($barobill, $member->biz_no);
+            if (! $channelId) {
                 return ['success' => false, 'channel' => 'alimtalk', 'error' => '등록된 카카오톡 채널이 없습니다'];
             }
 
@@ -981,10 +981,21 @@ private function sendAlimtalk(
 
             $templateName = $isReminder ? '전자계약_리마인드' : '전자계약_서명요청';
 
-            // 등록된 템플릿 본문과 정확히 일치해야 함 (변수만 치환)
-            $message = $isReminder
-                ? "안녕하세요, {$signer->name}님.\n아직 서명이 완료되지 않은 전자계약이 있습니다.\n\n ■ 계약명: {$contract->title}\n ■ 서명 기한: {$expires}\n\n 기한 내에 서명을 완료해 주세요."
-                : " 안녕하세요, {$signer->name}님. \n 전자계약 서명 요청이 도착했습니다.\n\n ■ 계약명: {$contract->title}\n ■ 서명 기한: {$expires}\n\n 아래 버튼을 눌러 계약서를 확인하고 서명해 주세요.";
+            // 등록된 템플릿 본문을 가져와서 변수 치환 (정확한 포맷 유지)
+            $templateContent = $this->getTemplateContent($barobill, $member->biz_no, $channelId, $templateName);
+
+            if ($templateContent) {
+                $message = str_replace(
+                    ['#{이름}', '#{계약명}', '#{기한}'],
+                    [$signer->name, $contract->title, $expires],
+                    $templateContent
+                );
+            } else {
+                // 템플릿 조회 실패 시 하드코딩 폴백
+                $message = $isReminder
+                    ? "안녕하세요, {$signer->name}님.\n아직 서명이 완료되지 않은 전자계약이 있습니다.\n\n ■ 계약명: {$contract->title}\n ■ 서명 기한: {$expires}\n\n 기한 내에 서명을 완료해 주세요."
+                    : " 안녕하세요, {$signer->name}님. \n 전자계약 서명 요청이 도착했습니다.\n\n ■ 계약명: {$contract->title}\n ■ 서명 기한: {$expires}\n\n 아래 버튼을 눌러 계약서를 확인하고 서명해 주세요.";
+            }
 
             $smsMessage = $smsFallback
                 ? "[SAM] {$signer->name}님, 전자계약 서명 요청이 도착했습니다. {$signUrl}"
@@ -992,15 +1003,16 @@ private function sendAlimtalk(
 
             $result = $barobill->sendATKakaotalkEx(
                 corpNum: $member->biz_no,
-                senderId: $senderId,
+                senderId: $member->barobill_id,
+                yellowId: $channelId,
                 templateName: $templateName,
                 receiverName: $signer->name,
                 receiverNum: preg_replace('/[^0-9]/', '', $signer->phone),
-                title: $isReminder ? '전자계약 리마인드' : '전자계약 서명 요청',
+                title: '',
                 message: $message,
                 buttons: [
                     [
-                        'Name' => $isReminder ? '서명하기' : '계약서 확인하기',
+                        'Name' => '계약서 확인하기',
                         'ButtonType' => 'WL',
                         'Url1' => $signUrl,
                         'Url2' => $signUrl,
@@ -1032,9 +1044,9 @@ private function sendAlimtalk(
     }
 
     /**
-     * 바로빌 카카오톡 채널 목록에서 발신프로필 키(ChannelId) 조회
+     * 바로빌 카카오톡 채널 ID 조회 (YellowId로 사용)
      */
-    private function getKakaotalkSenderId(BarobillService $barobill, string $bizNo): ?string
+    private function getKakaotalkChannelId(BarobillService $barobill, string $bizNo): ?string
     {
         $result = $barobill->getKakaotalkChannels($bizNo);
 
@@ -1044,10 +1056,7 @@ private function getKakaotalkSenderId(BarobillService $barobill, string $bizNo):
 
         $data = $result['data'];
 
-        // 바로빌 응답 형식에 따라 채널 목록 파싱
-        if (is_array($data) && isset($data[0])) {
-            $channels = $data;
-        } elseif (is_object($data) && isset($data->KakaotalkChannel)) {
+        if (is_object($data) && isset($data->KakaotalkChannel)) {
             $channels = is_array($data->KakaotalkChannel)
                 ? $data->KakaotalkChannel
                 : [$data->KakaotalkChannel];
@@ -1056,7 +1065,7 @@ private function getKakaotalkSenderId(BarobillService $barobill, string $bizNo):
                 ? $data['KakaotalkChannel']
                 : [$data['KakaotalkChannel']];
         } else {
-            $channels = [$data];
+            $channels = is_array($data) ? $data : [$data];
         }
 
         $channel = $channels[0] ?? null;
@@ -1070,6 +1079,35 @@ private function getKakaotalkSenderId(BarobillService $barobill, string $bizNo):
             : ($channel->ChannelId ?? null);
     }
 
+    /**
+     * 바로빌 등록 템플릿의 본문 내용 조회
+     */
+    private function getTemplateContent(BarobillService $barobill, string $bizNo, string $channelId, string $templateName): ?string
+    {
+        $result = $barobill->getKakaotalkTemplates($bizNo, $channelId);
+
+        if (! ($result['success'] ?? false) || empty($result['data'])) {
+            return null;
+        }
+
+        $data = $result['data'];
+        $items = [];
+
+        if (is_object($data) && isset($data->KakaotalkTemplate)) {
+            $items = is_array($data->KakaotalkTemplate)
+                ? $data->KakaotalkTemplate
+                : [$data->KakaotalkTemplate];
+        }
+
+        foreach ($items as $tpl) {
+            if (($tpl->TemplateName ?? '') === $templateName) {
+                return $tpl->TemplateContent ?? null;
+            }
+        }
+
+        return null;
+    }
+
     /**
      * PDF 다운로드
      */
diff --git a/app/Http/Controllers/ESign/EsignPublicController.php b/app/Http/Controllers/ESign/EsignPublicController.php
index e874f2f7..eb5a35a4 100644
--- a/app/Http/Controllers/ESign/EsignPublicController.php
+++ b/app/Http/Controllers/ESign/EsignPublicController.php
@@ -387,17 +387,51 @@ public function submitSignature(Request $request, string $token): JsonResponse
                         $member = BarobillMember::where('tenant_id', $contract->tenant_id)->first();
                         if ($member) {
                             $barobill = app(BarobillService::class);
-                            $barobill->setServerMode($member->is_test_mode ? 'test' : 'production');
+                            $barobill->setServerMode($member->server_mode ?? 'production');
                             $nextSignUrl = config('app.url').'/esign/sign/'.$nextSigner->access_token;
                             $nextExpires = $contract->expires_at?->format('Y-m-d H:i') ?? '없음';
+
+                            // 채널 ID 조회
+                            $channelResult = $barobill->getKakaotalkChannels($member->biz_no);
+                            $yellowId = '';
+                            if ($channelResult['success'] ?? false) {
+                                $chData = $channelResult['data'];
+                                if (is_object($chData) && isset($chData->KakaotalkChannel)) {
+                                    $ch = is_array($chData->KakaotalkChannel) ? $chData->KakaotalkChannel[0] : $chData->KakaotalkChannel;
+                                    $yellowId = $ch->ChannelId ?? '';
+                                }
+                            }
+
+                            // 템플릿 본문 조회하여 변수 치환
+                            $tplResult = $barobill->getKakaotalkTemplates($member->biz_no, $yellowId);
+                            $tplMessage = null;
+                            if ($tplResult['success'] ?? false) {
+                                $tplData = $tplResult['data'];
+                                $tplItems = [];
+                                if (is_object($tplData) && isset($tplData->KakaotalkTemplate)) {
+                                    $tplItems = is_array($tplData->KakaotalkTemplate) ? $tplData->KakaotalkTemplate : [$tplData->KakaotalkTemplate];
+                                }
+                                foreach ($tplItems as $t) {
+                                    if (($t->TemplateName ?? '') === '전자계약_서명요청') {
+                                        $tplMessage = str_replace(
+                                            ['#{이름}', '#{계약명}', '#{기한}'],
+                                            [$nextSigner->name, $contract->title, $nextExpires],
+                                            $t->TemplateContent
+                                        );
+                                        break;
+                                    }
+                                }
+                            }
+
                             $atResult = $barobill->sendATKakaotalkEx(
-                                corpNum: $member->corp_num,
-                                senderId: $member->kakaotalk_sender_id ?? '',
+                                corpNum: $member->biz_no,
+                                senderId: $member->barobill_id,
+                                yellowId: $yellowId,
                                 templateName: '전자계약_서명요청',
                                 receiverName: $nextSigner->name,
                                 receiverNum: preg_replace('/[^0-9]/', '', $nextSigner->phone),
-                                title: '전자계약 서명 요청',
-                                message: "안녕하세요, {$nextSigner->name}님.\n전자계약 서명 요청이 도착했습니다.\n\n■ 계약명: {$contract->title}\n■ 서명 기한: {$nextExpires}\n\n아래 버튼을 눌러 계약서를 확인하고 서명해 주세요.",
+                                title: '',
+                                message: $tplMessage ?? "안녕하세요, {$nextSigner->name}님.\n전자계약 서명 요청이 도착했습니다.\n\n■ 계약명: {$contract->title}\n■ 서명 기한: {$nextExpires}\n\n아래 버튼을 눌러 계약서를 확인하고 서명해 주세요.",
                                 buttons: [['Name' => '계약서 확인하기', 'ButtonType' => 'WL', 'Url1' => $nextSignUrl, 'Url2' => $nextSignUrl]],
                                 smsMessage: $nextSmsFallback ? "[SAM] {$nextSigner->name}님, 전자계약 서명 요청이 도착했습니다. {$nextSignUrl}" : '',
                             );
@@ -536,18 +570,30 @@ private function sendCompletionAlimtalk(EsignContract $contract, EsignSigner $si
             }
 
             $barobill = app(BarobillService::class);
-            $barobill->setServerMode($member->is_test_mode ? 'test' : 'production');
+            $barobill->setServerMode($member->server_mode ?? 'production');
+
+            // 채널 ID 조회
+            $channelResult = $barobill->getKakaotalkChannels($member->biz_no);
+            $yellowId = '';
+            if ($channelResult['success'] ?? false) {
+                $chData = $channelResult['data'];
+                if (is_object($chData) && isset($chData->KakaotalkChannel)) {
+                    $ch = is_array($chData->KakaotalkChannel) ? $chData->KakaotalkChannel[0] : $chData->KakaotalkChannel;
+                    $yellowId = $ch->ChannelId ?? '';
+                }
+            }
 
             $signUrl = config('app.url').'/esign/sign/'.$signer->access_token;
             $completedAt = $contract->completed_at?->format('Y-m-d H:i') ?? now()->format('Y-m-d H:i');
 
             $result = $barobill->sendATKakaotalkEx(
-                corpNum: $member->corp_num,
-                senderId: $member->kakaotalk_sender_id ?? '',
+                corpNum: $member->biz_no,
+                senderId: $member->barobill_id,
+                yellowId: $yellowId,
                 templateName: '전자계약_완료',
                 receiverName: $signer->name,
                 receiverNum: preg_replace('/[^0-9]/', '', $signer->phone),
-                title: '전자계약 완료',
+                title: '',
                 message: "안녕하세요, {$signer->name}님.\n전자계약이 모든 서명자의 서명 완료로 확정되었습니다.\n\n■ 계약명: {$contract->title}\n■ 완료일: {$completedAt}\n\n아래 버튼에서 서명 완료된 계약서를 확인할 수 있습니다.",
                 buttons: [
                     [
diff --git a/app/Services/Barobill/BarobillService.php b/app/Services/Barobill/BarobillService.php
index a1f5b171..dabfc9cf 100644
--- a/app/Services/Barobill/BarobillService.php
+++ b/app/Services/Barobill/BarobillService.php
@@ -1277,7 +1277,8 @@ public function getKakaotalkTemplateManagementUrl(string $corpNum, string $id):
      * 알림톡 단건 발송
      *
      * @param  string  $corpNum  회원사 사업자번호
-     * @param  string  $senderId  발신프로필 키 (채널 ID)
+     * @param  string  $senderId  바로빌 계정 ID
+     * @param  string  $yellowId  카카오톡 채널 ID (예: @codebridge-x)
      * @param  string  $templateName  템플릿 이름
      * @param  string  $receiverName  수신자 이름
      * @param  string  $receiverNum  수신자 전화번호
@@ -1285,11 +1286,13 @@ public function getKakaotalkTemplateManagementUrl(string $corpNum, string $id):
      * @param  string  $message  알림톡 본문
      * @param  string  $smsMessage  SMS 대체발송 메시지 (빈 값이면 대체발송 안 함)
      * @param  string  $smsSubject  SMS 대체발송 제목
+     * @param  string  $smsSenderNum  SMS 발신번호
      * @param  string  $reserveDT  예약일시 (YYYYMMDDHHmmss, 빈 값이면 즉시발송)
      */
     public function sendATKakaotalk(
         string $corpNum,
         string $senderId,
+        string $yellowId,
         string $templateName,
         string $receiverName,
         string $receiverNum,
@@ -1297,15 +1300,17 @@ public function sendATKakaotalk(
         string $message,
         string $smsMessage = '',
         string $smsSubject = '',
+        string $smsSenderNum = '',
         string $reserveDT = ''
     ): array {
         $params = [
             'CorpNum' => $this->formatBizNo($corpNum),
             'SenderID' => $senderId,
+            'YellowId' => $yellowId,
             'TemplateName' => $templateName,
             'SendDT' => $reserveDT,
-            'SmsReply' => '',
-            'SmsSenderNum' => '',
+            'SmsReply' => empty($smsMessage) ? 'N' : 'S',
+            'SmsSenderNum' => $smsSenderNum,
             'KakaotalkMessage' => [
                 'ReceiverName' => $receiverName,
                 'ReceiverNum' => $receiverNum,
@@ -1323,7 +1328,8 @@ public function sendATKakaotalk(
      * 알림톡 단건 발송 (버튼 포함)
      *
      * @param  string  $corpNum  회원사 사업자번호
-     * @param  string  $senderId  발신프로필 키
+     * @param  string  $senderId  바로빌 계정 ID
+     * @param  string  $yellowId  카카오톡 채널 ID (예: @codebridge-x)
      * @param  string  $templateName  템플릿 이름
      * @param  string  $receiverName  수신자 이름
      * @param  string  $receiverNum  수신자 전화번호
@@ -1332,11 +1338,13 @@ public function sendATKakaotalk(
      * @param  array  $buttons  버튼 배열 [{Name, ButtonType, Url1, Url2}]
      * @param  string  $smsMessage  SMS 대체발송 메시지
      * @param  string  $smsSubject  SMS 대체발송 제목
+     * @param  string  $smsSenderNum  SMS 발신번호
      * @param  string  $reserveDT  예약일시
      */
     public function sendATKakaotalkEx(
         string $corpNum,
         string $senderId,
+        string $yellowId,
         string $templateName,
         string $receiverName,
         string $receiverNum,
@@ -1345,6 +1353,7 @@ public function sendATKakaotalkEx(
         array $buttons = [],
         string $smsMessage = '',
         string $smsSubject = '',
+        string $smsSenderNum = '',
         string $reserveDT = ''
     ): array {
         $kakaotalkMessage = [
@@ -1363,11 +1372,11 @@ public function sendATKakaotalkEx(
         $params = [
             'CorpNum' => $this->formatBizNo($corpNum),
             'SenderID' => $senderId,
-            'YellowId' => '',
+            'YellowId' => $yellowId,
             'TemplateName' => $templateName,
             'SendDT' => $reserveDT,
-            'SmsReply' => '',
-            'SmsSenderNum' => '',
+            'SmsReply' => empty($smsMessage) ? 'N' : 'S',
+            'SmsSenderNum' => $smsSenderNum,
             'KakaotalkMessage' => $kakaotalkMessage,
         ];
 
@@ -1378,7 +1387,8 @@ public function sendATKakaotalkEx(
      * 알림톡 대량 발송
      *
      * @param  string  $corpNum  회원사 사업자번호
-     * @param  string  $senderId  발신프로필 키
+     * @param  string  $senderId  바로빌 계정 ID
+     * @param  string  $yellowId  카카오톡 채널 ID (예: @codebridge-x)
      * @param  string  $templateName  템플릿 이름
      * @param  array  $messages  메시지 배열 [{ReceiverName, ReceiverNum, Title, Message, SmsMessage, SmsSubject}]
      * @param  string  $reserveDT  예약일시
@@ -1386,6 +1396,7 @@ public function sendATKakaotalkEx(
     public function sendATKakaotalks(
         string $corpNum,
         string $senderId,
+        string $yellowId,
         string $templateName,
         array $messages,
         string $reserveDT = ''
@@ -1393,9 +1404,10 @@ public function sendATKakaotalks(
         $params = [
             'CorpNum' => $this->formatBizNo($corpNum),
             'SenderID' => $senderId,
+            'YellowId' => $yellowId,
             'TemplateName' => $templateName,
             'SendDT' => $reserveDT,
-            'SmsReply' => '',
+            'SmsReply' => 'N',
             'SmsSenderNum' => '',
             'KakaotalkMessages' => ['KakaotalkATMessage' => $messages],
         ];