public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
        .AddJwtBearer(options =>
        {
            options.TokenValidationParameters = new TokenValidationParameters
            {
                ValidateLifetime = true,
                ValidateIssuerSigningKey = true,
                IssuerSigningKey = new SymmetricSecurityKey(
                    System.Convert.FromBase64String(_configuration["ApproovTokenSecret"]))
            };
        });

    services.AddMvc();
}