How can I use ElevenLabs API for real-time voice synthesis in my app?

<!-- BEGIN COPY / PASTE -->
    import requests

    api_key = "YOUR_API_KEY"
    text = "Hello, welcome to our app!"
    url = "https://api.elevenlabs.io/v1/text-to-speech"

    headers = {
        "Content-Type": "application/json",
        "Authorization": f"Bearer {api_key}"
    }

    data = {
        "text": text,
        "voice": "en_us_male"
    }

    response = requests.post(url, json=data, headers=headers)

    if response.status_code == 200:
        with open("output.wav", "wb") as f:
            f.write(response.content)
    else:
        print("Error:", response.status_code, response.text)
    <!-- END COPY / PASTE -->