fix: [esign] 알림톡 발신프로필 키(SenderID) 조회 로직 추가

- senderId를 빈 문자열로 보내던 것을 바로빌 채널 목록에서 ChannelId 조회 후 전달
- 바로빌 API 오류 -24005 해결

app/Http/Controllers/ESign/EsignApiController.php

@@ -970,6 +970,12 @@ 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) {
+                return ['success' => false, 'channel' => 'alimtalk', 'error' => '등록된 카카오톡 채널이 없습니다'];
+            }
+
             $signUrl = config('app.url').'/esign/sign/'.$signer->access_token;
             $expires = $contract->expires_at?->format('Y-m-d H:i') ?? '없음';
 
@@ -985,7 +991,7 @@ private function sendAlimtalk(
 
             $result = $barobill->sendATKakaotalkEx(
                 corpNum: $member->biz_no,
-                senderId: '',
+                senderId: $senderId,
                 templateName: $templateName,
                 receiverName: $signer->name,
                 receiverNum: preg_replace('/[^0-9]/', '', $signer->phone),
@@ -1024,6 +1030,45 @@ private function sendAlimtalk(
         }
     }
 
+    /**
+     * 바로빌 카카오톡 채널 목록에서 발신프로필 키(ChannelId) 조회
+     */
+    private function getKakaotalkSenderId(BarobillService $barobill, string $bizNo): ?string
+    {
+        $result = $barobill->getKakaotalkChannels($bizNo);
+
+        if (! ($result['success'] ?? false) || empty($result['data'])) {
+            return null;
+        }
+
+        $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)) {
+            $channels = is_array($data->KakaotalkChannel)
+                ? $data->KakaotalkChannel
+                : [$data->KakaotalkChannel];
+        } elseif (is_array($data) && isset($data['KakaotalkChannel'])) {
+            $channels = is_array($data['KakaotalkChannel'])
+                ? $data['KakaotalkChannel']
+                : [$data['KakaotalkChannel']];
+        } else {
+            $channels = [$data];
+        }
+
+        $channel = $channels[0] ?? null;
+
+        if (! $channel) {
+            return null;
+        }
+
+        return is_array($channel)
+            ? ($channel['ChannelId'] ?? null)
+            : ($channel->ChannelId ?? null);
+    }
+
     /**
      * PDF 다운로드
      */