public string ProcessChallengeRequest(string token)
{
string keyThumbprintBase64 = JwsUtil.CreateJwsKey(this.PrivKey.PublicKey, out _, out _).CalcThumbprint()._Base64UrlEncode();
Con.WriteLine($"ACME: Processing the challenge token '{token}'.");
return(token + "." + keyThumbprintBase64);
}
