/// <summary>
        /// Add Claims to body parameter for POST request.
        /// </summary>
        /// <param name="oAuth2Client"><see cref="OAuth2Client"/> object for Token request.</param>
        /// <param name="requestParams"><see cref="AuthenticationRequestParameters"/> containing request parameters.</param>
        internal static void AddKerberosTicketClaim(
            OAuth2Client oAuth2Client,
            AuthenticationRequestParameters requestParams)
        {
            string kerberosClaim = GetKerberosTicketClaim(
                requestParams.RequestContext.ServiceBundle.Config.KerberosServicePrincipalName,
                requestParams.RequestContext.ServiceBundle.Config.TicketContainer);

            if (string.IsNullOrEmpty(kerberosClaim))
            {
                oAuth2Client.AddBodyParameter(OAuth2Parameter.Claims, requestParams.ClaimsAndClientCapabilities);
            }
            else if (string.IsNullOrEmpty(requestParams.ClaimsAndClientCapabilities))
            {
                oAuth2Client.AddBodyParameter(OAuth2Parameter.Claims, kerberosClaim);
            }
            else
            {
                JObject existingClaims = JObject.Parse(requestParams.ClaimsAndClientCapabilities);
                JObject mergedClaims
                    = ClaimsHelper.MergeClaimsIntoCapabilityJson(kerberosClaim, existingClaims);

                oAuth2Client.AddBodyParameter(OAuth2Parameter.Claims, mergedClaims.ToString(Formatting.None));
            }
        }