Add certificate on request with RestSharp

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Ok, I got the solution.

First of all, I had to stop using the .crt and the .key for the certificate. I have to get a .pfx. This can be done with openssl command (openssl documentation)

openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

After creating the certificate, just add it to the request like this

var client = new RestClient(url);

ServicePointManager.Expect100Continue = true;
ServicePointManager.DefaultConnectionLimit = 9999;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;

var certFile = Path.Combine(certificateFolder, "certificate.pfx");
X509Certificate2 certificate = new X509Certificate2(certFile, onboard.authentication.secret);
client.ClientCertificates = new X509CertificateCollection() { certificate };
client.Proxy = new WebProxy();
var restrequest = new RestRequest(Method.POST);
restrequest.AddHeader("Cache-Control", "no-cache");
restrequest.AddHeader("Accept", "application/json");
restrequest.AddHeader("Content-Type", "application/json");
restrequest.AddParameter("myStuff", ParameterType.RequestBody);
IRestResponse response = client.Execute(restrequest);

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