diff --git a/app/Http/Controllers/Api/V1/TaxInvoiceController.php b/app/Http/Controllers/Api/V1/TaxInvoiceController.php
index 2fe8dcf..fabda45 100644
--- a/app/Http/Controllers/Api/V1/TaxInvoiceController.php
+++ b/app/Http/Controllers/Api/V1/TaxInvoiceController.php
@@ -6,6 +6,7 @@
 use App\Http\Controllers\Controller;
 use App\Http\Requests\TaxInvoice\CancelTaxInvoiceRequest;
 use App\Http\Requests\TaxInvoice\CreateTaxInvoiceRequest;
+use App\Http\Requests\TaxInvoice\SaveSupplierSettingsRequest;
 use App\Http\Requests\TaxInvoice\TaxInvoiceListRequest;
 use App\Http\Requests\TaxInvoice\TaxInvoiceSummaryRequest;
 use App\Http\Requests\TaxInvoice\UpdateTaxInvoiceRequest;
@@ -148,4 +149,44 @@ public function summary(TaxInvoiceSummaryRequest $request)
             message: __('message.fetched')
         );
     }
+
+    /**
+     * 공급자 설정 조회
+     */
+    public function supplierSettings()
+    {
+        $settings = $this->taxInvoiceService->getSupplierSettings();
+
+        return ApiResponse::handle(
+            data: $settings,
+            message: __('message.fetched')
+        );
+    }
+
+    /**
+     * 공급자 설정 저장
+     */
+    public function saveSupplierSettings(SaveSupplierSettingsRequest $request)
+    {
+        $settings = $this->taxInvoiceService->saveSupplierSettings($request->validated());
+
+        return ApiResponse::handle(
+            data: $settings,
+            message: __('message.updated')
+        );
+    }
+
+    /**
+     * 세금계산서 생성 + 즉시 발행
+     */
+    public function storeAndIssue(CreateTaxInvoiceRequest $request)
+    {
+        $taxInvoice = $this->taxInvoiceService->createAndIssue($request->validated());
+
+        return ApiResponse::handle(
+            data: $taxInvoice,
+            message: __('message.tax_invoice.issued'),
+            status: 201
+        );
+    }
 }
diff --git a/app/Http/Requests/TaxInvoice/SaveSupplierSettingsRequest.php b/app/Http/Requests/TaxInvoice/SaveSupplierSettingsRequest.php
new file mode 100644
index 0000000..b1a28bd
--- /dev/null
+++ b/app/Http/Requests/TaxInvoice/SaveSupplierSettingsRequest.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Requests\TaxInvoice;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class SaveSupplierSettingsRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'business_number' => ['required', 'string', 'max:20'],
+            'company_name' => ['required', 'string', 'max:100'],
+            'representative_name' => ['required', 'string', 'max:50'],
+            'address' => ['nullable', 'string', 'max:255'],
+            'business_type' => ['nullable', 'string', 'max:100'],
+            'business_item' => ['nullable', 'string', 'max:100'],
+            'contact_name' => ['nullable', 'string', 'max:50'],
+            'contact_phone' => ['nullable', 'string', 'max:20'],
+            'contact_email' => ['nullable', 'email', 'max:100'],
+        ];
+    }
+}
diff --git a/app/Services/BarobillService.php b/app/Services/BarobillService.php
index 1d8451f..b9517bc 100644
--- a/app/Services/BarobillService.php
+++ b/app/Services/BarobillService.php
@@ -4,37 +4,130 @@
 
 use App\Models\Tenants\BarobillSetting;
 use App\Models\Tenants\TaxInvoice;
-use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Log;
+use SoapClient;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 
 /**
- * 바로빌 API 연동 서비스
+ * 바로빌 API 연동 서비스 (SOAP)
  *
  * 바로빌 개발자센터: https://dev.barobill.co.kr/
+ * 바로빌은 SOAP API만 제공하므로 SoapClient를 사용합니다.
  */
 class BarobillService extends Service
 {
     /**
-     * 바로빌 API 기본 URL
+     * 바로빌 SOAP 기본 URL
      */
-    private const API_BASE_URL = 'https://ws.barobill.co.kr';
+    private const SOAP_BASE_URL = 'https://ws.baroservice.com';
 
     /**
-     * 바로빌 API 테스트 URL
+     * 바로빌 SOAP 테스트 URL
      */
-    private const API_TEST_URL = 'https://testws.barobill.co.kr';
+    private const SOAP_TEST_URL = 'https://testws.baroservice.com';
 
     /**
      * 테스트 모드 여부
      */
     private bool $testMode;
 
+    /**
+     * TI(Tax Invoice) SOAP 클라이언트
+     */
+    private ?SoapClient $tiSoapClient = null;
+
     public function __construct()
     {
         $this->testMode = config('services.barobill.test_mode', true);
     }
 
+    // =========================================================================
+    // SOAP 클라이언트
+    // =========================================================================
+
+    /**
+     * TI SOAP 클라이언트 초기화/반환
+     */
+    private function getTiSoapClient(): SoapClient
+    {
+        if ($this->tiSoapClient === null) {
+            $baseUrl = $this->testMode ? self::SOAP_TEST_URL : self::SOAP_BASE_URL;
+
+            $context = stream_context_create([
+                'ssl' => [
+                    'verify_peer' => ! $this->testMode,
+                    'verify_peer_name' => ! $this->testMode,
+                    'allow_self_signed' => $this->testMode,
+                ],
+            ]);
+
+            $this->tiSoapClient = new SoapClient($baseUrl.'/TI.asmx?WSDL', [
+                'trace' => true,
+                'encoding' => 'UTF-8',
+                'exceptions' => true,
+                'connection_timeout' => 30,
+                'stream_context' => $context,
+                'cache_wsdl' => WSDL_CACHE_NONE,
+            ]);
+        }
+
+        return $this->tiSoapClient;
+    }
+
+    /**
+     * SOAP API 호출
+     *
+     * MNG EtaxController::callBarobillSOAP() 포팅
+     * 음수 반환값 = 에러 코드 (바로빌 규격)
+     */
+    private function callSoap(string $method, array $params): array
+    {
+        $client = $this->getTiSoapClient();
+
+        if (! isset($params['CERTKEY'])) {
+            $setting = $this->getSetting();
+            if (! $setting) {
+                return [
+                    'success' => false,
+                    'error' => '바로빌 설정이 없습니다.',
+                ];
+            }
+            $params['CERTKEY'] = $setting->cert_key;
+        }
+
+        try {
+            $result = $client->$method($params);
+            $resultProperty = $method.'Result';
+
+            if (isset($result->$resultProperty)) {
+                $resultData = $result->$resultProperty;
+
+                // 바로빌 규격: 음수 반환값은 에러 코드
+                if (is_numeric($resultData) && $resultData < 0) {
+                    return [
+                        'success' => false,
+                        'error' => '바로빌 API 오류 코드: '.$resultData,
+                        'error_code' => (int) $resultData,
+                    ];
+                }
+
+                return ['success' => true, 'data' => $resultData];
+            }
+
+            return ['success' => true, 'data' => $result];
+        } catch (\SoapFault $e) {
+            return [
+                'success' => false,
+                'error' => 'SOAP 오류: '.$e->getMessage(),
+            ];
+        } catch (\Throwable $e) {
+            return [
+                'success' => false,
+                'error' => 'API 호출 오류: '.$e->getMessage(),
+            ];
+        }
+    }
+
     // =========================================================================
     // 설정 관리
     // =========================================================================
@@ -78,7 +171,7 @@ public function saveSetting(array $data): BarobillSetting
     }
 
     /**
-     * 연동 테스트
+     * 연동 테스트 (SOAP)
      */
     public function testConnection(): array
     {
@@ -89,26 +182,31 @@ public function testConnection(): array
         }
 
         try {
-            // 바로빌 API 토큰 조회로 연동 테스트
-            $response = $this->callApi('GetAccessToken', [
+            $response = $this->callSoap('GetAccessToken', [
                 'CERTKEY' => $setting->cert_key,
                 'CorpNum' => $setting->corp_num,
                 'ID' => $setting->barobill_id,
             ]);
 
-            if (! empty($response['AccessToken'])) {
-                // 검증 성공 시 verified_at 업데이트
-                $setting->verified_at = now();
-                $setting->save();
+            if ($response['success']) {
+                $resultData = $response['data'];
 
-                return [
-                    'success' => true,
-                    'message' => __('message.barobill.connection_success'),
-                    'verified_at' => $setting->verified_at->toDateTimeString(),
-                ];
+                // 양수 또는 문자열 토큰 = 성공
+                if (is_string($resultData) || (is_numeric($resultData) && $resultData > 0)) {
+                    $setting->verified_at = now();
+                    $setting->save();
+
+                    return [
+                        'success' => true,
+                        'message' => __('message.barobill.connection_success'),
+                        'verified_at' => $setting->verified_at->toDateTimeString(),
+                    ];
+                }
             }
 
-            throw new BadRequestHttpException($response['Message'] ?? __('error.barobill.connection_failed'));
+            throw new \Exception($response['error'] ?? __('error.barobill.connection_failed'));
+        } catch (BadRequestHttpException $e) {
+            throw $e;
         } catch (\Exception $e) {
             Log::error('바로빌 연동 테스트 실패', [
                 'tenant_id' => $this->tenantId(),
@@ -161,52 +259,29 @@ public function checkBusinessNumber(string $businessNumber): array
             ];
         }
 
-        // 바로빌 API 조회 시도
+        // 바로빌 SOAP API 조회 시도
         try {
-            $response = $this->callApi('CheckCorpNum', [
+            $response = $this->callSoap('CheckCorpNum', [
                 'CorpNum' => $businessNumber,
             ]);
 
-            // 바로빌 응답 해석
-            if (isset($response['CorpState'])) {
-                $state = $response['CorpState'];
-                $isValid = in_array($state, ['01', '02']); // 01: 사업중, 02: 휴업
-                $statusLabel = match ($state) {
-                    '01' => '사업중',
-                    '02' => '휴업',
-                    '03' => '폐업',
-                    default => '조회 불가',
-                };
+            if ($response['success']) {
+                $resultData = $response['data'];
 
-                return [
-                    'valid' => $isValid,
-                    'status' => $state,
-                    'status_label' => $statusLabel,
-                    'corp_name' => $response['CorpName'] ?? null,
-                    'ceo_name' => $response['CEOName'] ?? null,
-                    'message' => $isValid
-                        ? __('message.company.business_number_valid')
-                        : __('error.company.business_closed'),
-                ];
+                // 양수 결과 = 유효한 사업자
+                if (is_numeric($resultData) && $resultData >= 0) {
+                    return [
+                        'valid' => true,
+                        'status' => 'active',
+                        'status_label' => '유효함',
+                        'corp_name' => null,
+                        'ceo_name' => null,
+                        'message' => __('message.company.business_number_valid'),
+                    ];
+                }
             }
 
-            // 응답 형식이 다른 경우 (결과 코드 방식)
-            if (isset($response['Result'])) {
-                $isValid = $response['Result'] >= 0;
-
-                return [
-                    'valid' => $isValid,
-                    'status' => $isValid ? 'active' : 'unknown',
-                    'status_label' => $isValid ? '유효함' : '조회 불가',
-                    'corp_name' => $response['CorpName'] ?? null,
-                    'ceo_name' => $response['CEOName'] ?? null,
-                    'message' => $isValid
-                        ? __('message.company.business_number_valid')
-                        : ($response['Message'] ?? __('error.company.check_failed')),
-                ];
-            }
-
-            // 기본 응답 (체크섬만 통과한 경우)
+            // API 실패 시 형식 검증 결과만 반환
             return [
                 'valid' => true,
                 'status' => 'format_valid',
@@ -266,7 +341,9 @@ private function validateBusinessNumberChecksum(string $businessNumber): bool
     // =========================================================================
 
     /**
-     * 세금계산서 발행
+     * 세금계산서 발행 (SOAP RegistAndIssueTaxInvoice)
+     *
+     * MNG EtaxController::issueTaxInvoice() 포팅
      */
     public function issueTaxInvoice(TaxInvoice $taxInvoice): TaxInvoice
     {
@@ -277,16 +354,13 @@ public function issueTaxInvoice(TaxInvoice $taxInvoice): TaxInvoice
         }
 
         try {
-            // 바로빌 API 호출을 위한 데이터 구성
             $apiData = $this->buildTaxInvoiceData($taxInvoice, $setting);
+            $response = $this->callSoap('RegistAndIssueTaxInvoice', $apiData);
 
-            // 세금계산서 발행 API 호출
-            $response = $this->callApi('RegistAndIssueTaxInvoice', $apiData);
-
-            if (! empty($response['InvoiceID'])) {
-                // 발행 성공
-                $taxInvoice->barobill_invoice_id = $response['InvoiceID'];
-                $taxInvoice->nts_confirm_num = $response['NTSConfirmNum'] ?? null;
+            if ($response['success']) {
+                $resultData = $response['data'];
+                // 바로빌 규격: 양수 반환값이 Invoice ID
+                $taxInvoice->barobill_invoice_id = is_numeric($resultData) ? (string) $resultData : null;
                 $taxInvoice->status = TaxInvoice::STATUS_ISSUED;
                 $taxInvoice->issued_at = now();
                 $taxInvoice->error_message = null;
@@ -295,13 +369,15 @@ public function issueTaxInvoice(TaxInvoice $taxInvoice): TaxInvoice
                 Log::info('세금계산서 발행 성공', [
                     'tenant_id' => $this->tenantId(),
                     'tax_invoice_id' => $taxInvoice->id,
-                    'barobill_invoice_id' => $response['InvoiceID'],
+                    'barobill_invoice_id' => $taxInvoice->barobill_invoice_id,
                 ]);
 
                 return $taxInvoice->fresh();
             }
 
-            throw new \Exception($response['Message'] ?? '발행 실패');
+            throw new \Exception($response['error'] ?? '발행 실패');
+        } catch (BadRequestHttpException $e) {
+            throw $e;
         } catch (\Exception $e) {
             // 발행 실패
             $taxInvoice->status = TaxInvoice::STATUS_FAILED;
@@ -319,7 +395,7 @@ public function issueTaxInvoice(TaxInvoice $taxInvoice): TaxInvoice
     }
 
     /**
-     * 세금계산서 취소
+     * 세금계산서 취소 (SOAP CancelTaxInvoice)
      */
     public function cancelTaxInvoice(TaxInvoice $taxInvoice, string $reason): TaxInvoice
     {
@@ -334,16 +410,15 @@ public function cancelTaxInvoice(TaxInvoice $taxInvoice, string $reason): TaxInv
         }
 
         try {
-            // 세금계산서 취소 API 호출
-            $response = $this->callApi('CancelTaxInvoice', [
+            $response = $this->callSoap('ProcTaxInvoice', [
                 'CERTKEY' => $setting->cert_key,
                 'CorpNum' => $setting->corp_num,
-                'ID' => $setting->barobill_id,
-                'InvoiceID' => $taxInvoice->barobill_invoice_id,
+                'MgtNum' => $taxInvoice->barobill_invoice_id,
+                'ProcType' => 4, // 4: 발행취소
                 'Memo' => $reason,
             ]);
 
-            if ($response['Result'] === 0 || ! empty($response['Success'])) {
+            if ($response['success']) {
                 $taxInvoice->status = TaxInvoice::STATUS_CANCELLED;
                 $taxInvoice->cancelled_at = now();
                 $taxInvoice->description = ($taxInvoice->description ? $taxInvoice->description."\n" : '').'취소 사유: '.$reason;
@@ -358,7 +433,9 @@ public function cancelTaxInvoice(TaxInvoice $taxInvoice, string $reason): TaxInv
                 return $taxInvoice->fresh();
             }
 
-            throw new \Exception($response['Message'] ?? '취소 실패');
+            throw new \Exception($response['error'] ?? '취소 실패');
+        } catch (BadRequestHttpException $e) {
+            throw $e;
         } catch (\Exception $e) {
             Log::error('세금계산서 취소 실패', [
                 'tenant_id' => $this->tenantId(),
@@ -371,7 +448,7 @@ public function cancelTaxInvoice(TaxInvoice $taxInvoice, string $reason): TaxInv
     }
 
     /**
-     * 국세청 전송 상태 조회
+     * 국세청 전송 상태 조회 (SOAP GetTaxInvoiceState)
      */
     public function checkNtsSendStatus(TaxInvoice $taxInvoice): TaxInvoice
     {
@@ -386,27 +463,38 @@ public function checkNtsSendStatus(TaxInvoice $taxInvoice): TaxInvoice
         }
 
         try {
-            $response = $this->callApi('GetTaxInvoiceState', [
+            $response = $this->callSoap('GetTaxInvoiceState', [
                 'CERTKEY' => $setting->cert_key,
                 'CorpNum' => $setting->corp_num,
-                'ID' => $setting->barobill_id,
-                'InvoiceID' => $taxInvoice->barobill_invoice_id,
+                'MgtNum' => $taxInvoice->barobill_invoice_id,
             ]);
 
-            if (! empty($response['State'])) {
-                $taxInvoice->nts_send_status = $response['State'];
+            if ($response['success'] && $response['data']) {
+                $stateData = $response['data'];
 
-                // 국세청 전송 완료 시 상태 업데이트
-                if ($response['State'] === '전송완료' && ! $taxInvoice->sent_at) {
-                    $taxInvoice->status = TaxInvoice::STATUS_SENT;
-                    $taxInvoice->sent_at = now();
-                    $taxInvoice->nts_confirm_num = $response['NTSConfirmNum'] ?? $taxInvoice->nts_confirm_num;
+                // SOAP 결과 객체에서 상태 추출
+                $state = is_object($stateData) ? ($stateData->NTSSendState ?? null) : null;
+
+                if ($state !== null) {
+                    $taxInvoice->nts_send_status = (string) $state;
+
+                    // 국세청 전송 완료 시 상태 업데이트
+                    if (in_array($state, [3, '3', '전송완료']) && ! $taxInvoice->sent_at) {
+                        $taxInvoice->status = TaxInvoice::STATUS_SENT;
+                        $taxInvoice->sent_at = now();
+
+                        if (is_object($stateData) && ! empty($stateData->NTSConfirmNum)) {
+                            $taxInvoice->nts_confirm_num = $stateData->NTSConfirmNum;
+                        }
+                    }
+
+                    $taxInvoice->save();
                 }
-
-                $taxInvoice->save();
             }
 
             return $taxInvoice->fresh();
+        } catch (BadRequestHttpException $e) {
+            throw $e;
         } catch (\Exception $e) {
             Log::error('국세청 전송 상태 조회 실패', [
                 'tenant_id' => $this->tenantId(),
@@ -423,126 +511,123 @@ public function checkNtsSendStatus(TaxInvoice $taxInvoice): TaxInvoice
     // =========================================================================
 
     /**
-     * 바로빌 API 호출
-     */
-    private function callApi(string $method, array $data): array
-    {
-        $baseUrl = $this->testMode ? self::API_TEST_URL : self::API_BASE_URL;
-        $url = $baseUrl.'/TI/'.$method;
-
-        $response = Http::timeout(30)
-            ->withHeaders([
-                'Content-Type' => 'application/json',
-            ])
-            ->post($url, $data);
-
-        if ($response->failed()) {
-            throw new \Exception('API 호출 실패: '.$response->status());
-        }
-
-        return $response->json() ?? [];
-    }
-
-    /**
-     * 세금계산서 발행용 데이터 구성
+     * 세금계산서 발행용 데이터 구성 (MNG SOAP 형식)
+     *
+     * MNG EtaxController::issueTaxInvoice() 의 Invoice 구조를 포팅
+     * InvoicerParty/InvoiceeParty/TaxInvoiceTradeLineItems 중첩 구조
      */
     private function buildTaxInvoiceData(TaxInvoice $taxInvoice, BarobillSetting $setting): array
     {
-        // 품목 데이터 구성
-        $items = [];
-        foreach ($taxInvoice->items ?? [] as $index => $item) {
-            $items[] = [
-                'PurchaseDT' => $taxInvoice->issue_date->format('Ymd'),
-                'ItemName' => $item['name'] ?? '',
-                'Spec' => $item['spec'] ?? '',
-                'Qty' => $item['qty'] ?? 1,
-                'UnitCost' => $item['unit_price'] ?? 0,
-                'SupplyCost' => $item['supply_amt'] ?? 0,
-                'Tax' => $item['tax_amt'] ?? 0,
-                'Remark' => $item['remark'] ?? '',
+        $supplyAmt = (int) $taxInvoice->supply_amount;
+        $taxAmt = (int) $taxInvoice->tax_amount;
+        $total = (int) $taxInvoice->total_amount;
+        $taxType = $taxAmt == 0 ? 2 : 1; // 1:과세, 2:영세, 3:면세
+
+        // 관리번호 (유니크)
+        $mgtNum = 'SAM'.date('YmdHis').$taxInvoice->id;
+
+        // 품목 구성
+        $tradeLineItems = [];
+        foreach ($taxInvoice->items ?? [] as $item) {
+            $tradeLineItems[] = [
+                'PurchaseExpiry' => $taxInvoice->issue_date->format('Ymd'),
+                'Name' => $item['name'] ?? '',
+                'Information' => $item['spec'] ?? '',
+                'ChargeableUnit' => (string) ($item['qty'] ?? 1),
+                'UnitPrice' => (string) ($item['unit_price'] ?? 0),
+                'Amount' => (string) ($item['supply_amt'] ?? 0),
+                'Tax' => (string) ($item['tax_amt'] ?? 0),
+                'Description' => $item['remark'] ?? '',
             ];
         }
 
         // 품목이 없는 경우 기본 품목 추가
-        if (empty($items)) {
-            $items[] = [
-                'PurchaseDT' => $taxInvoice->issue_date->format('Ymd'),
-                'ItemName' => $taxInvoice->description ?? '품목',
-                'Spec' => '',
-                'Qty' => 1,
-                'UnitCost' => (float) $taxInvoice->supply_amount,
-                'SupplyCost' => (float) $taxInvoice->supply_amount,
-                'Tax' => (float) $taxInvoice->tax_amount,
-                'Remark' => '',
+        if (empty($tradeLineItems)) {
+            $tradeLineItems[] = [
+                'PurchaseExpiry' => $taxInvoice->issue_date->format('Ymd'),
+                'Name' => $taxInvoice->description ?? '품목',
+                'Information' => '',
+                'ChargeableUnit' => '1',
+                'UnitPrice' => (string) $supplyAmt,
+                'Amount' => (string) $supplyAmt,
+                'Tax' => (string) $taxAmt,
+                'Description' => '',
             ];
         }
 
         return [
-            'CERTKEY' => $setting->cert_key,
             'CorpNum' => $setting->corp_num,
-            'ID' => $setting->barobill_id,
-            'TaxInvoice' => [
-                'InvoiceType' => $this->mapInvoiceType($taxInvoice->invoice_type),
-                'IssueType' => $this->mapIssueType($taxInvoice->issue_type),
-                'TaxType' => '과세',
-                'PurposeType' => '영수',
+            'Invoice' => [
+                'IssueDirection' => 1, // 1: 정발행
+                'TaxInvoiceType' => $this->mapInvoiceTypeToCode($taxInvoice->invoice_type),
+                'ModifyCode' => '',
+                'TaxType' => $taxType,
+                'TaxCalcType' => 1, // 1: 소계합계
+                'PurposeType' => 2, // 2: 청구
                 'WriteDate' => $taxInvoice->issue_date->format('Ymd'),
-
-                // 공급자 정보
-                'InvoicerCorpNum' => $taxInvoice->supplier_corp_num,
-                'InvoicerCorpName' => $taxInvoice->supplier_corp_name,
-                'InvoicerCEOName' => $taxInvoice->supplier_ceo_name,
-                'InvoicerAddr' => $taxInvoice->supplier_addr,
-                'InvoicerBizType' => $taxInvoice->supplier_biz_type,
-                'InvoicerBizClass' => $taxInvoice->supplier_biz_class,
-                'InvoicerContactID' => $taxInvoice->supplier_contact_id,
-
-                // 공급받는자 정보
-                'InvoiceeCorpNum' => $taxInvoice->buyer_corp_num,
-                'InvoiceeCorpName' => $taxInvoice->buyer_corp_name,
-                'InvoiceeCEOName' => $taxInvoice->buyer_ceo_name,
-                'InvoiceeAddr' => $taxInvoice->buyer_addr,
-                'InvoiceeBizType' => $taxInvoice->buyer_biz_type,
-                'InvoiceeBizClass' => $taxInvoice->buyer_biz_class,
-                'InvoiceeContactID' => $taxInvoice->buyer_contact_id,
-
-                // 금액 정보
-                'SupplyCostTotal' => (int) $taxInvoice->supply_amount,
-                'TaxTotal' => (int) $taxInvoice->tax_amount,
-                'TotalAmount' => (int) $taxInvoice->total_amount,
-
-                // 품목 정보
-                'TaxInvoiceTradeLineItems' => $items,
-
-                // 비고
+                'AmountTotal' => (string) $supplyAmt,
+                'TaxTotal' => (string) $taxAmt,
+                'TotalAmount' => (string) $total,
+                'Cash' => '0',
+                'ChkBill' => '0',
+                'Note' => '0',
+                'Credit' => (string) $total,
                 'Remark1' => $taxInvoice->description ?? '',
+                'Remark2' => '',
+                'Remark3' => '',
+                'InvoicerParty' => [
+                    'MgtNum' => $mgtNum,
+                    'CorpNum' => $taxInvoice->supplier_corp_num,
+                    'TaxRegID' => '',
+                    'CorpName' => $taxInvoice->supplier_corp_name,
+                    'CEOName' => $taxInvoice->supplier_ceo_name ?? '',
+                    'Addr' => $taxInvoice->supplier_addr ?? '',
+                    'BizType' => $taxInvoice->supplier_biz_type ?? '',
+                    'BizClass' => $taxInvoice->supplier_biz_class ?? '',
+                    'ContactID' => $setting->barobill_id,
+                    'ContactName' => $setting->contact_name ?? '',
+                    'TEL' => $setting->contact_tel ?? '',
+                    'HP' => '',
+                    'Email' => $setting->contact_id ?? '',
+                ],
+                'InvoiceeParty' => [
+                    'MgtNum' => '',
+                    'CorpNum' => str_replace('-', '', $taxInvoice->buyer_corp_num ?? ''),
+                    'TaxRegID' => '',
+                    'CorpName' => $taxInvoice->buyer_corp_name ?? '',
+                    'CEOName' => $taxInvoice->buyer_ceo_name ?? '',
+                    'Addr' => $taxInvoice->buyer_addr ?? '',
+                    'BizType' => $taxInvoice->buyer_biz_type ?? '',
+                    'BizClass' => $taxInvoice->buyer_biz_class ?? '',
+                    'ContactID' => '',
+                    'ContactName' => '',
+                    'TEL' => '',
+                    'HP' => '',
+                    'Email' => $taxInvoice->buyer_contact_id ?? '',
+                ],
+                'BrokerParty' => [],
+                'TaxInvoiceTradeLineItems' => [
+                    'TaxInvoiceTradeLineItem' => $tradeLineItems,
+                ],
             ],
+            'SendSMS' => false,
+            'ForceIssue' => false,
+            'MailTitle' => '',
         ];
     }
 
     /**
-     * 세금계산서 유형 매핑
+     * 세금계산서 유형을 바로빌 코드로 매핑
+     *
+     * @return int 1: 세금계산서, 2: 계산서, 4: 수정세금계산서
      */
-    private function mapInvoiceType(string $type): string
+    private function mapInvoiceTypeToCode(string $type): int
     {
         return match ($type) {
-            TaxInvoice::TYPE_TAX_INVOICE => '세금계산서',
-            TaxInvoice::TYPE_INVOICE => '계산서',
-            TaxInvoice::TYPE_MODIFIED_TAX_INVOICE => '수정세금계산서',
-            default => '세금계산서',
-        };
-    }
-
-    /**
-     * 발행 유형 매핑
-     */
-    private function mapIssueType(string $type): string
-    {
-        return match ($type) {
-            TaxInvoice::ISSUE_TYPE_NORMAL => '정발행',
-            TaxInvoice::ISSUE_TYPE_REVERSE => '역발행',
-            TaxInvoice::ISSUE_TYPE_TRUSTEE => '위수탁',
-            default => '정발행',
+            TaxInvoice::TYPE_TAX_INVOICE => 1,
+            TaxInvoice::TYPE_INVOICE => 2,
+            TaxInvoice::TYPE_MODIFIED_TAX_INVOICE => 4,
+            default => 1,
         };
     }
 }
diff --git a/app/Services/TaxInvoiceService.php b/app/Services/TaxInvoiceService.php
index 19cd6c8..862a46b 100644
--- a/app/Services/TaxInvoiceService.php
+++ b/app/Services/TaxInvoiceService.php
@@ -271,6 +271,70 @@ public function checkStatus(int $id): TaxInvoice
         return $this->barobillService->checkNtsSendStatus($taxInvoice);
     }
 
+    // =========================================================================
+    // 공급자 설정
+    // =========================================================================
+
+    /**
+     * 공급자 설정 조회 (BarobillSetting 기반)
+     */
+    public function getSupplierSettings(): array
+    {
+        $setting = $this->barobillService->getSetting();
+
+        if (! $setting) {
+            return [];
+        }
+
+        return [
+            'business_number' => $setting->corp_num,
+            'company_name' => $setting->corp_name,
+            'representative_name' => $setting->ceo_name,
+            'address' => $setting->addr,
+            'business_type' => $setting->biz_type,
+            'business_item' => $setting->biz_class,
+            'contact_name' => $setting->contact_name,
+            'contact_phone' => $setting->contact_tel,
+            'contact_email' => $setting->contact_id,
+        ];
+    }
+
+    /**
+     * 공급자 설정 저장
+     */
+    public function saveSupplierSettings(array $data): array
+    {
+        $this->barobillService->saveSetting([
+            'corp_num' => $data['business_number'] ?? null,
+            'corp_name' => $data['company_name'] ?? null,
+            'ceo_name' => $data['representative_name'] ?? null,
+            'addr' => $data['address'] ?? null,
+            'biz_type' => $data['business_type'] ?? null,
+            'biz_class' => $data['business_item'] ?? null,
+            'contact_name' => $data['contact_name'] ?? null,
+            'contact_tel' => $data['contact_phone'] ?? null,
+            'contact_id' => $data['contact_email'] ?? null,
+        ]);
+
+        return $this->getSupplierSettings();
+    }
+
+    // =========================================================================
+    // 생성+발행 통합
+    // =========================================================================
+
+    /**
+     * 세금계산서 생성 후 즉시 발행
+     */
+    public function createAndIssue(array $data): TaxInvoice
+    {
+        return DB::transaction(function () use ($data) {
+            $taxInvoice = $this->create($data);
+
+            return $this->barobillService->issueTaxInvoice($taxInvoice);
+        });
+    }
+
     // =========================================================================
     // 통계
     // =========================================================================
diff --git a/routes/api/v1/finance.php b/routes/api/v1/finance.php
index 1654646..5668842 100644
--- a/routes/api/v1/finance.php
+++ b/routes/api/v1/finance.php
@@ -283,13 +283,16 @@
     Route::get('', [TaxInvoiceController::class, 'index'])->name('v1.tax-invoices.index');
     Route::post('', [TaxInvoiceController::class, 'store'])->name('v1.tax-invoices.store');
     Route::get('/summary', [TaxInvoiceController::class, 'summary'])->name('v1.tax-invoices.summary');
+    Route::get('/supplier-settings', [TaxInvoiceController::class, 'supplierSettings'])->name('v1.tax-invoices.supplier-settings');
+    Route::put('/supplier-settings', [TaxInvoiceController::class, 'saveSupplierSettings'])->name('v1.tax-invoices.save-supplier-settings');
+    Route::post('/issue-direct', [TaxInvoiceController::class, 'storeAndIssue'])->name('v1.tax-invoices.issue-direct');
+    Route::post('/bulk-issue', [TaxInvoiceController::class, 'bulkIssue'])->name('v1.tax-invoices.bulk-issue');
     Route::get('/{id}', [TaxInvoiceController::class, 'show'])->whereNumber('id')->name('v1.tax-invoices.show');
     Route::put('/{id}', [TaxInvoiceController::class, 'update'])->whereNumber('id')->name('v1.tax-invoices.update');
     Route::delete('/{id}', [TaxInvoiceController::class, 'destroy'])->whereNumber('id')->name('v1.tax-invoices.destroy');
     Route::post('/{id}/issue', [TaxInvoiceController::class, 'issue'])->whereNumber('id')->name('v1.tax-invoices.issue');
     Route::post('/{id}/cancel', [TaxInvoiceController::class, 'cancel'])->whereNumber('id')->name('v1.tax-invoices.cancel');
     Route::get('/{id}/check-status', [TaxInvoiceController::class, 'checkStatus'])->whereNumber('id')->name('v1.tax-invoices.check-status');
-    Route::post('/bulk-issue', [TaxInvoiceController::class, 'bulkIssue'])->name('v1.tax-invoices.bulk-issue');
 });
 
 // Bad Debt API (악성채권 추심관리)