How to combine two flat lists into one nested object

Question

I have three lists which contains three same properties in each collection. I want to combine a result into one collection. Ex classes structure is as below

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Answer 1

There seems to be a number of questions here combined, I'll try to work through them:

Data Models and Deserialization

With respect to generating a single structure from your API response, I would recommend using the Newtonsoft.Json libraries, available on NuGet Json.NET. They will allow you to deserialize the response from your API, into a single object, which given the sample you provided, should contain a collection of each of your models, Order, PaymentDetail, CouponUsageDetail:

public class APIResponceContainer
{
    [JsonProperty("Orders")]
    public List Orders { get; set; }
    [JsonProperty("PaymentDetails")]
    public List PaymentDetails { get; set; }
    [JsonProperty("CouponUsageDetails")]
    public List CouponUsageDetails { get; set; }

    public APIResponceContainer()
    {
        Orders = new List();
        PaymentDetails = new List();
        CouponUsageDetails = new List();
    }
}

Be aware to add the required attributes to each of your models as so:

public class Order
{
    [JsonProperty("ProductId")]
    public int ProductId { get; set; }
    [JsonProperty("CustomerId")]
    public int CustomerId { get; set; }
    [JsonProperty("OrderId")]
    public int OrderId { get; set; }
}

Deserialization then happens from your JSON string, as such:

StringReader stringReader = new StringReader(myJSONString);
JsonSerializer js = JsonSerializer.Create();
APIResponceContainer APIResponce = (APIResponceContainer)js.Deserialize(stringReader, typeof(APIResponceContainer));

Queries

As discussed in the comments, your data is unfortunately in terrible need of normalization. However, what I have inferred is that you would like to produce a flat structure, maintaining the "Few other Properties" and "key properties", for a combination of Order, PaymentDetail and CouponUsageDetail. You can use Linq for this, importantly I would recommend you choose yourself a "Primary Key". In other words, one property that can independently tie all the others together. In the example below, I have choose OrderID since it should be unique (?):

var flatSequence =
            from order in APIResponce.Orders
            join coupon in APIResponce.CouponUsageDetails on order.OrderId equals coupon.OrderId
            join payment in APIResponce.PaymentDetails on order.OrderId equals payment.OrderId
            select new
            {
                // Here extract all the properties you care about
                OrderID = order.OrderId,
                Customer = order.CustomerId,
                Product = order.ProductId,
                // All the "other Properties" ?
                BankDetail = payment.PaymentOnlyProperty
            };

Here I have extracted to var, however if you know the final flat structure you would like, of course determine a class of your own to receive the result.

Please comment if there is any questions.