private static readonly string _IdentityServerAddress = "https://identity.avepointonlineservices.com";

private static readonly string _AosAppClientId = " ";

private static readonly string _ConnectorCertificateThumbprint = " ";

private static readonly string _ConnectorScope = "records.readwrite.all";

private void SendRquest() {

    var accessToken = GetAccessToken();

    var requestUrl = "SubmitRecords POST URL";

    var parameter = "SubmitRecords Parameter";

    var reponse = WebUtil.SendRequestForIds("Post", requestUrl, accessToken, JsonConvert.SerializeObject(parameter));

}

private string GetAccessToken() {

    var client = new HttpClient();

    var disco = await httpClient.GetDiscoveryDocumentAsync(IdentityServerAddress);

    var request = new ClientCredentialsTokenRequest

    {

        Address = disco.TokenEndpoint,

        ClientAssertion = new ClientAssertion

        {

            Type = OidcConstants.ClientAssertionTypes.JwtBearer,

            Value = CreateClientAuthJwt(disco, tenantId)

        },

        Scope = _ConnectorScope,

    };

    var tokenResponse = await httpClient.RequestClientCredentialsTokenAsync(request);

    return tokenResponse.AccessToken;

}

private string CreateClientAuthJwt(DiscoveryDocumentResponse response)

{

    var tokenHandler = new JwtSecurityTokenHandler { TokenLifetimeInMinutes = 10 };

    var subject = new ClaimsIdentity(new List<Claim>

    {

        new Claim("sub", IdentityServerClientId),

        new Claim("jti", Guid.NewGuid().ToString()),

    });

    var securityToken = tokenHandler.CreateJwtSecurityToken(

        issuer: _AosAppClientId,

        audience: response.TokenEndpoint,

        subject: subject,

        signingCredentials: new SigningCredentials(new X509SecurityKey(GetCertificate(_ConnectorCertificateThumbprint)), "RS256")

    );

    return tokenHandler.WriteToken(securityToken);

}