diff --git a/api/send_broadcast.php b/api/send_broadcast.php
index 80c298b..d70de50 100644
--- a/api/send_broadcast.php
+++ b/api/send_broadcast.php
@@ -211,13 +211,18 @@ try {
                 $messageContent = $message;
             }
             
-            if ($response && isset($response['success']) && $response['success']) {
+            // La API de WhatsApp devuelve {"messaging_product":"whatsapp","messages":[{"id":"wamid.xxx"}]}
+            // No tiene clave "success" — verificar por la presencia de messages o contacts
+            $sentMessageId = $response['messages'][0]['id'] ?? null;
+            $isSuccess = $response && (isset($response['messages']) || isset($response['contacts']) || $sentMessageId);
+
+            if ($isSuccess) {
                 $sentCount++;
                 
                 // Guardar mensaje en BD
                 $db->insert('conversations', [
                     'user_id' => $user['id'],
-                    'message_id' => $response['message_id'] ?? null,
+                    'message_id' => $sentMessageId,
                     'content' => $messageContent,
                     'direction' => 'outgoing',
                     'message_type' => $messageType === 'template' ? 'template' : 'text',
@@ -228,7 +233,7 @@ try {
                 $errorCount++;
                 $errors[] = [
                     'phone' => $user['phone_number'],
-                    'error' => 'Respuesta inválida de WhatsApp'
+                    'error' => 'Sin respuesta de WhatsApp: ' . json_encode($response)
                 ];
             }