diff --git a/client/src/pages/BLReconciliation.tsx b/client/src/pages/BLReconciliation.tsx
index aa2299f..0cafb19 100644
--- a/client/src/pages/BLReconciliation.tsx
+++ b/client/src/pages/BLReconciliation.tsx
@@ -513,26 +513,37 @@ export default function BLReconciliation() {
     startProcessingTimer();
 
     try {
-      const formData = new FormData();
-      formData.append('file', selectedFile);
-      formData.append('supplier', selectedDeliveryForInvoice.supplier?.name || '');
-      formData.append('blNumber', selectedDeliveryForInvoice.blNumber || '');
-      formData.append('type', 'Facture');
-
-      // Créer un AbortController pour gérer le timeout
-      const controller = new AbortController();
-      const timeoutId = setTimeout(() => controller.abort(), 60000); // 60 secondes
-
-      const response = await fetch(selectedDeliveryForInvoice.group.webhookUrl, {
-        method: 'POST',
-        body: formData,
-        signal: controller.signal,
+      // Convertir le fichier en base64 pour l'envoyer via notre route backend
+      const fileBase64 = await new Promise<string>((resolve, reject) => {
+        const reader = new FileReader();
+        reader.onload = () => {
+          const base64 = (reader.result as string).split(',')[1]; // Retirer le préfixe data:...
+          resolve(base64);
+        };
+        reader.onerror = reject;
+        reader.readAsDataURL(selectedFile);
       });
 
-      clearTimeout(timeoutId);
+      // Préparer les données pour la route backend proxy
+      const payload = {
+        webhookUrl: selectedDeliveryForInvoice.group.webhookUrl,
+        formDataFields: {
+          file: {
+            base64: fileBase64,
+            filename: selectedFile.name,
+            contentType: selectedFile.type
+          },
+          supplier: selectedDeliveryForInvoice.supplier?.name || '',
+          blNumber: selectedDeliveryForInvoice.blNumber || '',
+          type: 'Facture'
+        }
+      };
 
-      if (!response.ok) {
-        throw new Error(`Erreur ${response.status}: ${response.statusText}`);
+      // Envoyer via la route backend proxy (évite les problèmes CORS)
+      const response = await apiRequest('/api/reconciliation/send-invoice-webhook', 'POST', payload);
+
+      if (!response || !response.success) {
+        throw new Error(response?.error || 'Erreur lors de l\'envoi');
       }
 
       handleCloseWaitingModal();
diff --git a/package-lock.json b/package-lock.json
index 0adb9fa..51b2686 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,6 +41,7 @@
         "@radix-ui/react-tooltip": "^1.2.0",
         "@tanstack/react-query": "^5.60.5",
         "@types/bcrypt": "^6.0.0",
+        "@types/form-data": "^2.2.1",
         "@types/memoizee": "^0.4.12",
         "@types/node-fetch": "^2.6.13",
         "@types/pg": "^8.15.4",
@@ -58,6 +59,7 @@
         "express": "^4.21.2",
         "express-rate-limit": "^7.5.1",
         "express-session": "^1.18.1",
+        "form-data": "^4.0.4",
         "framer-motion": "^11.13.1",
         "iconv-lite": "^0.6.3",
         "input-otp": "^1.4.2",
@@ -3750,6 +3752,15 @@
         "@types/express": "*"
       }
     },
+    "node_modules/@types/form-data": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.2.1.tgz",
+      "integrity": "sha512-JAMFhOaHIciYVh8fb5/83nmuO/AHwmto+Hq7a9y8FzLDcC1KCU344XDOMEmahnrTFlHjgh4L0WJFczNIX2GxnQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/http-errors": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.5.tgz",
diff --git a/package.json b/package.json
index 7acdf08..38abed8 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "@radix-ui/react-tooltip": "^1.2.0",
     "@tanstack/react-query": "^5.60.5",
     "@types/bcrypt": "^6.0.0",
+    "@types/form-data": "^2.2.1",
     "@types/memoizee": "^0.4.12",
     "@types/node-fetch": "^2.6.13",
     "@types/pg": "^8.15.4",
@@ -60,6 +61,7 @@
     "express": "^4.21.2",
     "express-rate-limit": "^7.5.1",
     "express-session": "^1.18.1",
+    "form-data": "^4.0.4",
     "framer-motion": "^11.13.1",
     "iconv-lite": "^0.6.3",
     "input-otp": "^1.4.2",
diff --git a/server/routes.ts b/server/routes.ts
index 78cf794..d710e1b 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -788,6 +788,103 @@ export async function registerRoutes(app: Express): Promise<Server> {
     }
   });
 
+  // Route proxy pour envoi de factures vers webhook (accessible admin + directeur)
+  app.post('/api/reconciliation/send-invoice-webhook', isAuthenticated, async (req: any, res) => {
+    try {
+      const userId = req.user?.claims?.sub || req.user?.id;
+      if (!userId) {
+        return res.status(401).json({ error: 'Utilisateur non authentifié' });
+      }
+
+      const user = await storage.getUserWithGroups(userId);
+      if (!user) {
+        return res.status(404).json({ error: 'Utilisateur non trouvé' });
+      }
+
+      // Autoriser admin ET directeur
+      if (user.role !== 'admin' && user.role !== 'directeur') {
+        return res.status(403).json({ error: 'Accès refusé - Admin ou Directeur uniquement' });
+      }
+
+      const { webhookUrl, formDataFields } = req.body;
+
+      if (!webhookUrl || !formDataFields) {
+        return res.status(400).json({ error: 'Données manquantes: webhookUrl ou formDataFields' });
+      }
+
+      console.log('📤 INVOICE: Envoi facture via webhook', { 
+        webhookUrl: webhookUrl.substring(0, 50) + '...', 
+        userId: user.id,
+        userRole: user.role,
+        fieldsCount: Object.keys(formDataFields).length
+      });
+
+      // Préparer le FormData pour l'envoi au webhook externe
+      const FormData = (await import('form-data')).default;
+      const formData = new FormData();
+
+      // Ajouter tous les champs du formData
+      for (const [key, value] of Object.entries(formDataFields)) {
+        if (key === 'file' && typeof value === 'object' && (value as any).base64) {
+          // Reconstituer le fichier depuis base64
+          const fileData = value as { base64: string; filename: string; contentType: string };
+          const buffer = Buffer.from(fileData.base64, 'base64');
+          formData.append('file', buffer, {
+            filename: fileData.filename,
+            contentType: fileData.contentType
+          });
+        } else {
+          formData.append(key, value as string);
+        }
+      }
+
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), 60000); // 60 secondes
+
+      const response = await fetch(webhookUrl, {
+        method: 'POST',
+        body: formData as any,
+        headers: formData.getHeaders(),
+        signal: controller.signal
+      });
+
+      clearTimeout(timeoutId);
+
+      if (!response.ok) {
+        const errorText = await response.text();
+        console.error('❌ INVOICE: Erreur webhook', { status: response.status, errorText: errorText.substring(0, 200) });
+        throw new Error(`Erreur webhook: ${response.status} ${response.statusText}`);
+      }
+
+      const result = await response.text();
+      console.log('✅ INVOICE: Webhook réussi', { userId: user.id, userRole: user.role });
+
+      res.json({
+        success: true,
+        message: 'Facture envoyée avec succès',
+        webhookResponse: result
+      });
+
+    } catch (error: any) {
+      console.error('❌ INVOICE: Erreur envoi facture:', {
+        name: error.name,
+        message: error.message
+      });
+
+      let errorMessage = 'Erreur lors de l\'envoi de la facture';
+      if (error.name === 'AbortError') {
+        errorMessage = 'Timeout - Le traitement a pris trop de temps';
+      } else if (error.message) {
+        errorMessage = error.message;
+      }
+
+      res.status(500).json({ 
+        error: errorMessage,
+        details: error.message 
+      });
+    }
+  });
+
   // Auth routes handled by authSwitch (local or Replit)
 
   // Groups routes