RestSharp has recently released a major new version with a lot of breaking changes. One of the things to change was custom authenticators which now seem to be less obvious to use.

The documentation suggests creating a custom authenticator by inheriting from IAuthenticator but this doesn’t seem to work and it’s necessary to inherit from AuthenticatorBase instead. Possibly this is just a case of the documentation not having caught up with the code changes yet but in the meantime the below code demonstrates how to create a custom authenticator for adding an authentication query string parameter to a URL.

public class MetOfficeDataPointAuthenticator : AuthenticatorBase
{
    public MetOfficeDataPointAuthenticator(string apiKey) : base(apiKey) { }

    protected override ValueTask<Parameter> GetAuthenticationParameter(string apiKey)
        => new(new QueryParameter("key", apiKey));
}

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