public class BaseController : ApiController
{
    private const string Token = "thirdyparty.token";
    private string Token
    {
        set
        {
            var claimsIdentity = (ClaimsIdentity)User.Identity;
            var claims = claimsIdentity.Claims;
            var tokenClaim = claims.FirstOrDefault(x => x.Type == EstecToken);

            if (Token != null)
            {
                claimsIdentity.RemoveClaim(tokenClaim);
            }
            claimsIdentity.AddClaim(new Claim(Token, value));
        }
        get
        {
            var claimsIdentity = (ClaimsIdentity)User.Identity;
            var claims = claimsIdentity.Claims;
            var tokenClaim = claims.FirstOrDefault(x => x.Type == Token);

            return tokenClaim?.Value;
        }
    }
}