diff --git a/api.py b/api.py
index 61bfbe2..d364764 100644
--- a/api.py
+++ b/api.py
@@ -2966,6 +2966,68 @@ async def preview_societe():
         return f"<h1>Erreur</h1><p>{str(e)}</p>"
 
 
+@app.post("/factures/{numero_facture}/valider", status_code=200, tags=["Factures"])
+async def valider_facture(
+    numero_facture: str,
+    _: AsyncSession = Depends(get_session),
+):
+    try:
+        resultat = sage_client.valider_facture(numero_facture)
+        logger.info(
+            f"Facture {numero_facture} validée: {resultat.get('action_effectuee')}"
+        )
+        return {
+            "success": True,
+            "message": resultat.get("message", "Facture validée"),
+            "data": resultat,
+        }
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Erreur validation facture {numero_facture}: {e}")
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.post("/factures/{numero_facture}/devalider", status_code=200, tags=["Factures"])
+async def devalider_facture(
+    numero_facture: str,
+    _: AsyncSession = Depends(get_session),
+):
+    try:
+        resultat = sage_client.devalider_facture(numero_facture)
+        logger.info(
+            f"Facture {numero_facture} dévalidée: {resultat.get('action_effectuee')}"
+        )
+        return {
+            "success": True,
+            "message": resultat.get("message", "Facture dévalidée"),
+            "data": resultat,
+        }
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Erreur dévalidation facture {numero_facture}: {e}")
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.get("/factures/{numero_facture}/statut-validation", tags=["Factures"])
+async def get_statut_validation_facture(
+    numero_facture: str,
+    _: AsyncSession = Depends(get_session),
+):
+    try:
+        resultat = sage_client.get_statut_validation(numero_facture)
+        return {
+            "success": True,
+            "data": resultat,
+        }
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Erreur lecture statut {numero_facture}: {e}")
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @app.post("/factures/{numero_facture}/regler", status_code=200, tags=["Règlements"])
 async def regler_facture(
     numero_facture: str,
diff --git a/sage_client.py b/sage_client.py
index 1907077..20aeddc 100644
--- a/sage_client.py
+++ b/sage_client.py
@@ -431,6 +431,18 @@ class SageGatewayClient:
         """Lit les informations de la société depuis P_DOSSIER"""
         return self._get("/sage/societe/info").get("data")
 
+    def valider_facture(self, numero_facture: str) -> dict:
+        response = self._post(f"/sage/factures/{numero_facture}/valider", {})
+        return response.get("data", {})
+
+    def devalider_facture(self, numero_facture: str) -> dict:
+        response = self._post(f"/sage/factures/{numero_facture}/devalider", {})
+        return response.get("data", {})
+
+    def get_statut_validation(self, numero_facture: str) -> dict:
+        response = self._get(f"/sage/factures/{numero_facture}/statut-validation")
+        return response.get("data", {})
+
     def regler_facture(
         self,
         numero_facture: str,