The more safety way to access the data through the api is to use a client id, client secret and a redirect url.
After creating the api access entry, a client secret will be created.
After creating the client id and client secret, it's possible to fetch the access token by this:
[NLESS.IO Url]/nless/AccessToken/Authenticate?client_id=...&client_secret=...&redirect_uri=https://nless.io&response_type=token
If every parameter is correct, the request will be redirect to the redirect uri with a new parameter "access_token", which contains a valid api access token.
⚠️ The access token is valid for 60 minutes.
Two ways of using the access token to fetch datas: