curl --request POST \
  --url https://api.sendrealm.com/imports/{import_id}/upload-url \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Sendrealm-Project-Id: <x-sendrealm-project-id>' \
  --data '
{
  "file_bytes": 262144000
}
'

const options = {
  method: 'POST',
  headers: {
    'X-Sendrealm-Project-Id': '<x-sendrealm-project-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({file_bytes: 262144000})
};

fetch('https://api.sendrealm.com/imports/{import_id}/upload-url', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sendrealm.com/imports/{import_id}/upload-url"

payload = { "file_bytes": 262144000 }
headers = {
    "X-Sendrealm-Project-Id": "<x-sendrealm-project-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "status": 123,
  "data": {
    "import_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "upload_url": "<string>",
    "method": "PUT",
    "headers": {},
    "expires_in_seconds": 123,
    "max_bytes": 123
  }
}