fetchGist.js

async function getGist(gistId, filename) {
  const url = `https://api.github.com/gists/${gistId}`;
  try {
    const response = await fetch(url);
    const json = await response.json();
    return JSON.parse(json.files[filename].content)
  } catch (err) {
    console.error(err)
  }
}

// USAGE:
// (async function() {
//   let payments = await getGist(paymentsGistId, 'payments.json');
  
//   console.log(payments.length);
  
//   payments = payments.reduce((acc, curr) => {
//     const key = `Q${moment(curr.)}`
//   });
// })();