How to call my assistant in a Google Scripts Function (Google Sheets)?

API
1

I call ChatGPT with the following App Script in a Google Sheet. I’ve created an assistant with an ID.
How can I call the assistant instead of having the role set to “you are a helpful assistant”?
Thanks in advance.

const SECRET_KEY = "myapikeylskadfjlkasjflk";
const MAX_TOKENS = 800;
const TEMPERATURE = 0.4;

function GPTturbo(prompt, temperature = 0.4, model = "gpt-4-1106-preview") {
  const url = "https://api.openai.com/v1/chat/completions";
  const payload = {
    model: model,
    messages: [
      { role: "system", content: "You are a helpful assistant." },
      { role: "user", content: prompt },
    ],
    temperature: TEMPERATURE,
    max_tokens: MAX_TOKENS,
  };
  const options = {
    contentType: "application/json",
    headers: { Authorization: "Bearer " + SECRET_KEY },
    payload: JSON.stringify(payload),
  };
  const res = JSON.parse(UrlFetchApp.fetch(url, options).getContentText());
  return res.choices[0].message.content.trim();
}
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