Through this explanation we assume that you have using WHMCS_API; on the begining of the file
And the API() class initialized as _api
If needed check the Getting Started page

Contents

• Function Overview
• Function Details
• Full Example

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Function Overview

Prototype: public GetOrders.GetOrders GetOrders(int LimitStart = 0, int LimitNumber = 25, int OrderID = -1, int UserID = -1, string Status = "")

Input:

• LimitStart: The offset for the returned log data (optional [default: 0])
• LimitNumber: The number of records to return (optional [default: 25])
• OrderID: The specific order id to obtain the details for (optional)
• UserID: The client id to obtain the details for (optional)
• Status: Find orders for a specific status (optional)

Output: GetOrders Model

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Function Details

To call it just use GetOrders.GetOrders orders = _api.GetOrders(UserID: 1);

This call to the function will ignore all arguments except ClientID

The GetClientsProducts model is inside it's own namespace (more info)

GetOrders Model

WHMCS API Reference: https://developers.whmcs.com/api-reference/getorders/

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Full example

using WHMCS_API;

namespace YourApp
{
  class YourClass
  {
    public void YourFunction()
    {
       API _api = new API("username", "password", "accesskey", "url");
       GetOrders.GetOrders orders = _api.GetOrders(OrderID: 1);
       Console.WriteLine("There are {0} items in this order", orders.Orders.Order.FirstOrDefault().LineItems.LineItems.Count());
       foreach(GetOrders.Lineitem item in orders.Orders.Order.FirstOrDefault().LineItems.LineItem)
       {
         Console.WriteLine("Item Name: {0}", item.Product);
       }
    }
  }
}