Authentication to the API is performed via the X-API-KEY header. Provide your API key as the basic header value. You do not need to provide a password.
All requests are required to be made over HTTPS. Any calls that are made over plain HTTP will fail.
curl -H 'X-API-KEY: APIKEY' https://api.resova.eu/v1/baskets
If you haven't already, you can sign up for a new account here. Once you have logged into your account head over to Settings > General Settings > Developer where your API KEY will be located.
Please note: trial accounts are unable to access the API for security reasons, only fully active accounts can make use of the API.
You will need to whitelist any ips you wish to make api calls from. To do so head to Settings > General Settings > Developer > IP Whitelisting