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public static async TaskTask<Assertion> LoginToGateway(IdCard idCard, X509Certificate2 userCert)
{
    var sosiGwAssertion = idCard.GetAssertion<AssertionType>();
    var security = new GW.Security
    {
        Timestamp = new GW.Timestamp { Created = DateTimeEx.UtcNowRound - TimeSpan.FromMinutes(5) },
        Assertion = sosiGwAssertion
    };
    const string endpointAddress = "http://test1.ekstern-test.nspop.dk:8080/sosigw/service/sosigw";
    await using var gwClient = new SosiGWFacadeClient(SosiGWSoapBinding, endpointAddress);
    var dig = (await gwClient.requestIdCardDigestForSigningAsync(security, "whatever")).requestIdCardDigestForSigningResponse;
    var digestHash = SHA1.HashData(dig.DigestValue);
    var signature = userCert.GetRSAPrivateKey().SignHash(digestHash, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
    var cardRequestBody = new signIdCardRequestBody
    {
        SignatureValue = signature,
        KeyInfo = new GW.KeyInfo
        {
            Item = new GW.X509Data { Item = userCert.Export(X509ContentType.Cert) }
        }
    };
    // The STS signed card is saved in the sosiGw cache and is used for future calls through the proxy
    var res = (await gwClient.signIdCardAsync(security, cardRequestBody)).signIdCardResponse;
    if (res != signIdCardResponse.ok) { throw new Exception("Gateway logon error"); }
    // Convert the GW Assertion to a dgwsType Assertion
    var sosiGwAssertionDocument = SerializerUtil.Serialize(sosiGwAssertion).Root;
    return SerializerUtil.Deserialize<dk.nsi.seal.dgwstypes.Assertion>(sosiGwAssertionDocument, nameof(AssertionType));
}