curl --request POST \
  --url https://partners-api.sandbox.securitize.io/oauth2/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data client_id=your-client-id \
  --data client_secret=your-client-secret

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/x-www-form-urlencoded'},
  body: new URLSearchParams({
    grant_type: 'client_credentials',
    client_id: 'your-client-id',
    client_secret: 'your-client-secret'
  })
};

fetch('https://partners-api.sandbox.securitize.io/oauth2/token', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://partners-api.sandbox.securitize.io/oauth2/token"

payload = {
    "grant_type": "client_credentials",
    "client_id": "your-client-id",
    "client_secret": "your-client-secret"
}
headers = {"Content-Type": "application/x-www-form-urlencoded"}

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

print(response.text)

{
  "token_type": "bearer",
  "access_token": "a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6",
  "expires_in": 7200
}

{
  "error_description": "Invalid client authentication",
  "error": "invalid_client"
}