diff --git a/app/routes/automation.py b/app/routes/automation.py
index 3d1967b..12296f1 100644
--- a/app/routes/automation.py
+++ b/app/routes/automation.py
@@ -76,6 +76,57 @@ async def automation_page(request: Request, user: dict = Depends(get_current_use
     })
 
 
+@router.post("/preview")
+async def preview_automation(
+    request: Request,
+    user: dict = Depends(get_current_user),
+    fecha: str = Form(...),
+):
+    conn = get_connection()
+    configs = {row["key"]: row["value"] for row in conn.execute("SELECT * FROM config").fetchall()}
+    conn.close()
+
+    fb, fb_ok, fb_msg = get_firebird_from_config(configs)
+    if not fb_ok:
+        return JSONResponse({"success": False, "message": f"Error Firebird: {fb_msg}"})
+
+    fecha_ini = f"{fecha} 00:00:00"
+    fecha_fin = f"{fecha} 23:59:59"
+    params = {"fecha_ini": fecha_ini, "fecha_fin": fecha_fin}
+
+    ok1, err1, rows_pac = fb.execute_query(_SQL_PACIENTES, params)
+    if not ok1:
+        fb.disconnect()
+        return JSONResponse({"success": False, "message": f"Error BD pacientes: {err1}"})
+
+    ok2, err2, rows_rda = fb.execute_query(_SQL_RDA, params)
+    fb.disconnect()
+    if not ok2:
+        return JSONResponse({"success": False, "message": f"Error BD RDA: {err2}"})
+
+    grupos = agrupar_por_recepcion(rows_rda)
+    total_examenes = sum(len(v) for v in grupos.values())
+
+    pacientes_preview = [
+        {
+            "doc": str(p.get("DOCIDENT", "")),
+            "nombre": f"{p.get('NOMBRES', '')} {p.get('APELLIDOS', '')}".strip(),
+            "tipo": str(p.get("TIPOIDENT", "")),
+        }
+        for p in rows_pac[:10]
+    ]
+
+    return JSONResponse({
+        "success": True,
+        "fecha": fecha,
+        "pacientes": len(rows_pac),
+        "recepciones": len(grupos),
+        "examenes": total_examenes,
+        "pacientes_preview": pacientes_preview,
+        "hay_mas": len(rows_pac) > 10,
+    })
+
+
 @router.post("/run")
 async def run_automation(
     request: Request,
diff --git a/app/routes/config.py b/app/routes/config.py
index 13ae93d..5bd8677 100644
--- a/app/routes/config.py
+++ b/app/routes/config.py
@@ -1,7 +1,8 @@
 from fastapi import APIRouter, Request, Form, Depends
-from fastapi.responses import RedirectResponse
+from fastapi.responses import JSONResponse, RedirectResponse
 from app.database import get_connection
 from app.auth import get_current_user
+from app.services.api_client import get_tns_token
 
 router = APIRouter(prefix="/config", tags=["config"])
 
@@ -45,6 +46,20 @@ async def config_page(request: Request, user: dict = Depends(get_current_user)):
     })
 
 
+@router.post("/test-tns")
+async def test_tns(
+    request: Request,
+    user: dict = Depends(get_current_user),
+    empresa: str = Form(""),
+    usuario: str = Form(""),
+    password: str = Form(""),
+):
+    token, err = await get_tns_token(empresa, usuario, password)
+    if token:
+        return JSONResponse({"success": True, "message": "Login TNS exitoso"})
+    return JSONResponse({"success": False, "message": err or "Error desconocido"})
+
+
 @router.post("/save")
 async def config_save(request: Request, user: dict = Depends(get_current_user)):
     form = await request.form()
diff --git a/app/routes/terceros.py b/app/routes/terceros.py
index 33871b1..fb99c02 100644
--- a/app/routes/terceros.py
+++ b/app/routes/terceros.py
@@ -79,8 +79,12 @@ async def preview_query(
     if not ok:
         return JSONResponse({"success": False, "message": f"Error Firebird: {msg}"})
 
+    if ":doc_num" in q["query_text"] and not doc_num:
+        fb.disconnect()
+        return JSONResponse({"success": False, "message": "Ingresa el número de documento para buscar el paciente"})
+
     params = {}
-    if ":doc_num" in q["query_text"] and doc_num:
+    if ":doc_num" in q["query_text"]:
         params["doc_num"] = doc_num
     if ":fecha_ini" in q["query_text"]:
         params["fecha_ini"] = "1900-01-01"
@@ -124,9 +128,13 @@ async def send_terceros(
     if not ok:
         return JSONResponse({"success": False, "message": f"Error Firebird: {msg}"})
 
+    if ":doc_num" in q["query_text"] and not doc_num:
+        fb.disconnect()
+        return JSONResponse({"success": False, "message": "Ingresa el número de documento"})
+
     params = {}
     if ":doc_num" in q["query_text"]:
-        params["doc_num"] = doc_num or configs.get("doc_num_default", "")
+        params["doc_num"] = doc_num
 
     success, error, rows = fb.execute_query(q["query_text"], params if params else None)
     fb.disconnect()
diff --git a/app/routes/transaccion.py b/app/routes/transaccion.py
index 44ab0bf..a75be7e 100644
--- a/app/routes/transaccion.py
+++ b/app/routes/transaccion.py
@@ -53,12 +53,13 @@ async def preview_transaccion(
     if not ok:
         return JSONResponse({"success": False, "message": f"Error Firebird: {msg}"})
 
+    if ":num_factura" in q["query_text"] and not factura:
+        fb.disconnect()
+        return JSONResponse({"success": False, "message": "Ingresa el número de factura"})
+
     params = {"fecha_ini": fecha_inicio, "fecha_fin": fecha_fin}
-    if ":num_factura" in q["query_text"] and factura:
-        params["num_factura"] = factura
-        prefijo = configs.get("api_prefijo", "")
-        if prefijo:
-            params["prefijo"] = prefijo
+    if ":num_factura" in q["query_text"]:
+        params["num_factura"] = int(factura) if factura.isdigit() else factura
 
     success, error, rows = fb.execute_query(q["query_text"], params)
     fb.disconnect()
@@ -101,12 +102,13 @@ async def send_transaccion(
     if not ok:
         return JSONResponse({"success": False, "message": f"Error Firebird: {msg}"})
 
+    if ":num_factura" in q["query_text"] and not factura:
+        fb.disconnect()
+        return JSONResponse({"success": False, "message": "Ingresa el número de factura"})
+
     params = {"fecha_ini": fecha_inicio, "fecha_fin": fecha_fin}
-    if ":num_factura" in q["query_text"] and factura:
-        params["num_factura"] = factura
-        prefijo = configs.get("api_prefijo", "")
-        if prefijo:
-            params["prefijo"] = prefijo
+    if ":num_factura" in q["query_text"]:
+        params["num_factura"] = int(factura) if factura.isdigit() else factura
 
     success, error, rows = fb.execute_query(q["query_text"], params)
     fb.disconnect()
diff --git a/app/templates/automation.html b/app/templates/automation.html
index 4cfe87f..94f8cfb 100644
--- a/app/templates/automation.html
+++ b/app/templates/automation.html
@@ -11,7 +11,7 @@
         <i class="fas fa-paper-plane mr-2 text-blue-500"></i>Envío automático por fecha
       </h3>
       <p class="text-xs text-gray-500 mt-1">
-        Selecciona una fecha, el sistema enviará todos los pacientes y sus RDA a TNS.
+        Selecciona una fecha para ver cuántos pacientes y RDA se enviarán a TNS.
       </p>
     </div>
     <div class="p-6">
@@ -21,15 +21,49 @@
           <input type="date" id="fecha-input" value="{{ today }}"
             class="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm focus:ring-2 focus:ring-blue-500 focus:border-blue-500">
         </div>
+        <button onclick="previewAutomation()"
+          id="btn-preview"
+          class="px-6 py-2 bg-gray-600 hover:bg-gray-700 text-white font-medium rounded-lg transition-colors flex items-center gap-2 whitespace-nowrap">
+          <i class="fas fa-eye"></i> Vista previa
+        </button>
         <button onclick="runAutomation()"
           id="btn-run"
-          class="px-6 py-2 bg-blue-600 hover:bg-blue-700 text-white font-medium rounded-lg transition-colors flex items-center gap-2 whitespace-nowrap">
+          class="px-6 py-2 bg-blue-600 hover:bg-blue-700 text-white font-medium rounded-lg transition-colors flex items-center gap-2 whitespace-nowrap disabled:opacity-50 disabled:cursor-not-allowed"
+          disabled>
           <i class="fas fa-play"></i> Ejecutar envío
         </button>
       </div>
     </div>
   </div>
 
+  <!-- Vista previa de datos -->
+  <div id="preview-section" class="hidden bg-white rounded-xl shadow-sm border border-gray-200">
+    <div class="px-6 py-4 border-b border-gray-200 flex items-center justify-between">
+      <h3 class="font-semibold text-gray-800"><i class="fas fa-search mr-2 text-gray-500"></i>Resumen de la fecha</h3>
+      <span id="preview-fecha" class="text-sm text-gray-500"></span>
+    </div>
+    <div class="p-6 space-y-4">
+      <div class="grid grid-cols-3 gap-4">
+        <div class="bg-blue-50 rounded-lg p-4 text-center">
+          <div id="cnt-pacientes" class="text-3xl font-bold text-blue-600">0</div>
+          <div class="text-sm text-blue-700 mt-1">Pacientes</div>
+        </div>
+        <div class="bg-purple-50 rounded-lg p-4 text-center">
+          <div id="cnt-recepciones" class="text-3xl font-bold text-purple-600">0</div>
+          <div class="text-sm text-purple-700 mt-1">Recepciones</div>
+        </div>
+        <div class="bg-green-50 rounded-lg p-4 text-center">
+          <div id="cnt-examenes" class="text-3xl font-bold text-green-600">0</div>
+          <div class="text-sm text-green-700 mt-1">Exámenes</div>
+        </div>
+      </div>
+      <div>
+        <p class="text-xs font-medium text-gray-600 mb-2">Primeros pacientes:</p>
+        <div id="preview-table" class="divide-y divide-gray-100 border border-gray-100 rounded-lg overflow-hidden text-sm"></div>
+      </div>
+    </div>
+  </div>
+
   <!-- Progreso -->
   <div id="progress-section" class="hidden space-y-4">
 
@@ -42,8 +76,7 @@
         </div>
         <span id="p1-badge" class="text-sm text-gray-400">Esperando...</span>
       </div>
-      <div id="p1-detalle" class="divide-y divide-gray-100 hidden">
-      </div>
+      <div id="p1-detalle" class="divide-y divide-gray-100 hidden"></div>
     </div>
 
     <!-- Paso 2 -->
@@ -55,14 +88,67 @@
         </div>
         <span id="p2-badge" class="text-sm text-gray-400">Esperando...</span>
       </div>
-      <div id="p2-detalle" class="divide-y divide-gray-100 hidden">
-      </div>
+      <div id="p2-detalle" class="divide-y divide-gray-100 hidden"></div>
     </div>
 
   </div>
 </div>
 
 <script>
+async function previewAutomation() {
+  const fecha = document.getElementById('fecha-input').value;
+  if (!fecha) { showToast('Selecciona una fecha', 'error'); return; }
+
+  const btn = document.getElementById('btn-preview');
+  showLoading(btn);
+
+  document.getElementById('preview-section').classList.add('hidden');
+  document.getElementById('progress-section').classList.add('hidden');
+  document.getElementById('btn-run').disabled = true;
+
+  const form = new FormData();
+  form.append('fecha', fecha);
+
+  try {
+    const resp = await fetch('/automation/preview', { method: 'POST', body: form, credentials: 'include' });
+    const data = await resp.json();
+    hideLoading(btn, '<i class="fas fa-eye"></i> Vista previa');
+
+    if (!data.success) {
+      showToast(data.message || 'Error al consultar', 'error');
+      return;
+    }
+
+    document.getElementById('cnt-pacientes').textContent = data.pacientes;
+    document.getElementById('cnt-recepciones').textContent = data.recepciones;
+    document.getElementById('cnt-examenes').textContent = data.examenes;
+    document.getElementById('preview-fecha').textContent = data.fecha;
+
+    const table = document.getElementById('preview-table');
+    if (data.pacientes === 0) {
+      table.innerHTML = '<div class="p-4 text-gray-400 text-center">No hay pacientes para esta fecha</div>';
+      showToast('No hay datos para esa fecha', 'warning');
+    } else {
+      table.innerHTML = data.pacientes_preview.map(p => `
+        <div class="flex items-center gap-3 px-4 py-2 text-sm hover:bg-gray-50">
+          <span class="text-gray-400 text-xs w-8">${p.tipo}</span>
+          <span class="text-gray-500 w-32 font-mono">${p.doc}</span>
+          <span class="text-gray-700 flex-1">${p.nombre}</span>
+        </div>
+      `).join('') + (data.hay_mas ? '<div class="px-4 py-2 text-xs text-gray-400">... y más pacientes</div>' : '');
+
+      document.getElementById('btn-run').disabled = false;
+      showToast(`${data.pacientes} paciente(s) y ${data.recepciones} recepción(es) encontradas`, 'success');
+    }
+
+    document.getElementById('preview-section').classList.remove('hidden');
+
+  } catch (e) {
+    hideLoading(btn, '<i class="fas fa-eye"></i> Vista previa');
+    showToast('Error de conexión', 'error');
+  }
+}
+
 async function runAutomation() {
   const fecha = document.getElementById('fecha-input').value;
   if (!fecha) { showToast('Selecciona una fecha', 'error'); return; }
@@ -71,6 +157,7 @@ async function runAutomation() {
 
   const btn = document.getElementById('btn-run');
   showLoading(btn);
+  document.getElementById('btn-preview').disabled = true;
   document.getElementById('progress-section').classList.remove('hidden');
   document.getElementById('p1-badge').textContent = 'Enviando...';
   document.getElementById('p1-badge').className = 'text-sm text-blue-500';
@@ -84,6 +171,7 @@ async function runAutomation() {
     const resp = await fetch('/automation/run', { method: 'POST', body: form, credentials: 'include' });
     const data = await resp.json();
     hideLoading(btn, '<i class="fas fa-play"></i> Ejecutar envío');
+    document.getElementById('btn-preview').disabled = false;
 
     if (!data.success) {
       showToast(data.message || 'Error', 'error');
@@ -94,22 +182,17 @@ async function runAutomation() {
 
     const r = data.resultado;
 
-    // Paso 1
     renderBadge('p1-badge', r.paso1_terceros.enviados, r.paso1_terceros.errores);
     renderDetalle('p1-detalle', r.paso1_terceros.detalle.map(d => ({
-      col1: d.doc,
-      col2: d.nombre,
-      col3: `${d.ok ? '✅' : '❌'} ${d.msg || ''}`,
-      ok: d.ok,
+      col1: d.doc, col2: d.nombre,
+      col3: `${d.ok ? '✅' : '❌'} ${d.msg || ''}`, ok: d.ok,
     })));
 
-    // Paso 2
     renderBadge('p2-badge', r.paso2_rda.enviados, r.paso2_rda.errores);
     renderDetalle('p2-detalle', r.paso2_rda.detalle.map(d => ({
       col1: `Fac. ${d.factura}`,
       col2: `Pac. ${d.paciente} — ${d.examenes} examen(es)`,
-      col3: `${d.ok ? '✅' : '❌'} ${d.msg || ''}`,
-      ok: d.ok,
+      col3: `${d.ok ? '✅' : '❌'} ${d.msg || ''}`, ok: d.ok,
     })));
 
     const totalErr = r.paso1_terceros.errores + r.paso2_rda.errores;
@@ -118,6 +201,7 @@ async function runAutomation() {
 
   } catch (e) {
     hideLoading(btn, '<i class="fas fa-play"></i> Ejecutar envío');
+    document.getElementById('btn-preview').disabled = false;
     showToast('Error de conexión', 'error');
   }
 }
@@ -138,7 +222,7 @@ function renderBadge(id, enviados, errores) {
 
 function renderDetalle(id, items) {
   const el = document.getElementById(id);
-  if (!items || items.length === 0) { return; }
+  if (!items || items.length === 0) return;
   el.innerHTML = items.map(i => `
     <div class="px-6 py-2 flex items-center gap-3 text-sm ${i.ok ? '' : 'bg-red-50'}">
       <span class="text-gray-500 w-28 shrink-0">${i.col1}</span>
diff --git a/app/templates/config.html b/app/templates/config.html
index 73f183a..fb8f0cf 100644
--- a/app/templates/config.html
+++ b/app/templates/config.html
@@ -53,23 +53,51 @@
 
                 <hr class="border-gray-200">
 
-                <h4 class="font-medium text-gray-800"><i class="fas fa-cloud mr-2 text-blue-500"></i>API de Envío</h4>
-                <div>
-                    <label class="block text-sm font-medium text-gray-700 mb-1">URL Base de la API</label>
-                    <input type="text" name="config_api_url"
-                        value="{{ configs|selectattr('key', 'equalto', 'api_url')|map(attribute='value')|first }}"
-                        class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm"
-                        placeholder="https://api.ejemplo.com">
+                <h4 class="font-medium text-gray-800"><i class="fas fa-key mr-2 text-orange-500"></i>Credenciales TNS</h4>
+                <p class="text-xs text-gray-500 -mt-2">Acceso a <strong>api.tns.co</strong> — portal de envío RIPS</p>
+                <div class="grid grid-cols-2 gap-4">
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Código Empresa</label>
+                        <input type="text" name="config_tns_empresa"
+                            value="{{ configs|selectattr('key', 'equalto', 'tns_empresa')|map(attribute='value')|first }}"
+                            class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm"
+                            placeholder="Ej: 9002787299">
+                    </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Código Sucursal</label>
+                        <input type="text" name="config_api_sucursal"
+                            value="{{ configs|selectattr('key', 'equalto', 'api_sucursal')|map(attribute='value')|first }}"
+                            class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm"
+                            placeholder="Ej: 81080">
+                    </div>
                 </div>
                 <div class="grid grid-cols-2 gap-4">
                     <div>
-                        <label class="block text-sm font-medium text-gray-700 mb-1">Método HTTP</label>
-                        <select name="config_api_method"
-                            class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm">
-                            <option value="POST" {% if (configs|selectattr('key', 'equalto', 'api_method')|map(attribute='value')|first) == 'POST' %}selected{% endif %}>POST</option>
-                            <option value="PUT" {% if (configs|selectattr('key', 'equalto', 'api_method')|map(attribute='value')|first) == 'PUT' %}selected{% endif %}>PUT</option>
-                        </select>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Usuario TNS</label>
+                        <input type="text" name="config_tns_usuario"
+                            value="{{ configs|selectattr('key', 'equalto', 'tns_usuario')|map(attribute='value')|first }}"
+                            class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm"
+                            placeholder="Ej: DOCUXER">
                     </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Contraseña TNS</label>
+                        <input type="password" name="config_tns_password"
+                            value="{{ configs|selectattr('key', 'equalto', 'tns_password')|map(attribute='value')|first }}"
+                            class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm">
+                    </div>
+                </div>
+                <div>
+                    <button type="button" onclick="testTNS()"
+                        class="px-4 py-2 bg-orange-50 text-orange-700 border border-orange-200 rounded-lg hover:bg-orange-100 text-sm font-medium">
+                        <i class="fas fa-satellite-dish mr-1"></i> Probar conexión TNS
+                    </button>
+                    <span id="tns-status" class="text-sm ml-3"></span>
+                </div>
+
+                <hr class="border-gray-200">
+
+                <h4 class="font-medium text-gray-800"><i class="fas fa-clock mr-2 text-blue-500"></i>API General</h4>
+                <div class="grid grid-cols-2 gap-4">
                     <div>
                         <label class="block text-sm font-medium text-gray-700 mb-1">Timeout (seg)</label>
                         <input type="number" name="config_api_timeout"
@@ -77,12 +105,6 @@
                             class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm">
                     </div>
                 </div>
-                <div>
-                    <label class="block text-sm font-medium text-gray-700 mb-1">API Key (Bearer token)</label>
-                    <input type="text" name="config_api_key"
-                        value="{{ configs|selectattr('key', 'equalto', 'api_key')|map(attribute='value')|first }}"
-                        class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 text-sm">
-                </div>
 
                 <hr class="border-gray-200">
 
@@ -112,6 +134,23 @@
 </div>
 
 <script>
+async function testTNS() {
+    const form = document.querySelector('form');
+    const status = document.getElementById('tns-status');
+    status.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Probando...';
+
+    const data = new FormData();
+    data.append('empresa', form.querySelector('[name="config_tns_empresa"]').value);
+    data.append('usuario', form.querySelector('[name="config_tns_usuario"]').value);
+    data.append('password', form.querySelector('[name="config_tns_password"]').value);
+
+    const resp = await fetch('/config/test-tns', { method: 'POST', body: data });
+    const result = await resp.json();
+    status.innerHTML = result.success
+        ? '<span class="text-green-600"><i class="fas fa-check-circle"></i> ' + (result.message || 'Conexión exitosa') + '</span>'
+        : '<span class="text-red-600"><i class="fas fa-times-circle"></i> ' + result.message + '</span>';
+}
+
 async function testFirebird() {
     const btn = event.target;
     const status = document.getElementById('fb-status');
diff --git a/rips_manager.db b/rips_manager.db
index 7249eed..8304297 100644
Binary files a/rips_manager.db and b/rips_manager.db differ