curl --request GET \
  --url https://www.presolve.com/api/v1/contacts \
  --header 'x-api-key: <api-key>'

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

fetch('https://www.presolve.com/api/v1/contacts', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://www.presolve.com/api/v1/contacts"

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

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

print(response.text)

{
  "success": true
}

{
  "success": false,
  "error": "<string>",
  "code": "<string>"
}

{
  "success": false,
  "error": "<string>",
  "code": "<string>"
}

{
  "success": false,
  "error": "<string>",
  "code": "<string>"
}

{
  "success": false,
  "error": "<string>",
  "code": "<string>"
}

{
  "success": false,
  "error": "<string>",
  "code": "<string>"
}