curl --request PUT \
  --url https://spaces.nexudus.com/api/public/proposals/{proposalId}/login \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "Email": "<string>"
}
'

import requests

url = "https://spaces.nexudus.com/api/public/proposals/{proposalId}/login"

payload = { "Email": "<string>" }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({Email: '<string>'})
};

fetch('https://spaces.nexudus.com/api/public/proposals/{proposalId}/login', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "file": 123,
  "accessToken": "<string>"
}