curl --request GET \
  --url https://api.tangoanalytics.com/v1/projectmgmt/batch/invoices \
  --header 'x-api-key: <api-key>' \
  --header 'x-client: <api-key>'

const options = {method: 'GET', headers: {'x-client': '<api-key>', 'x-api-key': '<api-key>'}};

fetch('https://api.tangoanalytics.com/v1/projectmgmt/batch/invoices', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.tangoanalytics.com/v1/projectmgmt/batch/invoices"

headers = {
    "x-client": "<api-key>",
    "x-api-key": "<api-key>"
}

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

print(response.text)

{
  "status": "OK",
  "status_message": "",
  "gu_id": "721c54c4-c7aa-4fa1-8fdfd6-c0cee161694d"
}