curl --request GET \
  --url https://spaces.nexudus.com/api/public/checkout/fields \
  --header 'Authorization: Basic <encoded-value>'

import requests

url = "https://spaces.nexudus.com/api/public/checkout/fields"

headers = {"Authorization": "Basic <encoded-value>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Basic <encoded-value>'}};

fetch('https://spaces.nexudus.com/api/public/checkout/fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));