如何从类库C#中的类进行http调用？

这就是我的Scheduler的样子： –

public class CustomerJob : BaseJob
{
    private readonly ICustomerSchedulerService _customerSchedulerService;

    public CustomerJob (ICustomerSchedulerService customerSchedulerService)
    {
        _customerSchedulerService= customerSchedulerService;
    }
    public override void Execute(IJobExecutionContext context)
    {
       var customers = _customerSchedulerService.CheckExpiredTask();
       foreach(var customer in customers)
       {
           //I need to make a post request to apple server for each customer
           //something like below however there is no HttpClient() available in this class
        //var client = new HttpClient();      
       //client.PostAsync("https://sandbox.itunes.apple.com/verifyReceipt",customer));
       }
        base.Execute(context);
    }
}

那么如何解决这个要求？

注意：-
我不希望将其移到API或基于Web的项目中,因为这个调度程序将从Web& API团队&其他).

谢谢.