Calling Gemini API from Google Appps Script

gas_gemini.gs

function gemini_(model, payload) {
  const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

  const api = 'generateContent';
  const url = `https://generativelanguage.googleapis.com/v1beta/models/${model}:${api}?key=${apiKey}`;

  const options = {
    method: 'POST',
    contentType: 'application/json',
    muteHttpExceptions: true,
    payload: JSON.stringify(payload),
  };

  const response = UrlFetchApp.fetch(url, options).getContentText()
  console.log(response)
  const data = JSON.parse(response);
  return data
}