POST /api/send-message

{
  "api_key": "your_api_key",
  "number": "966501234567",
  "message": "مرحباً بك في خدمة واتساب"
}

{
  "success": true,
  "results": [
    {
      "number": "966501234567",
      "message_id": "12345678",
      "status": "sent"
    }
  ]
}

curl -X POST http://localhost:3000/api/send-message \
  -H "Content-Type: application/json" \
  -d '{
    "api_key": "your_api_key",
    "number": "966501234567",
    "message": "مرحباً بك"
  }'