function.csx

#r "Newtonsoft.Json"

using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;

static Random Random = new Random();

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
    string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
    var shippingDetails = JsonConvert.DeserializeObject<ShippingDetails>(requestBody);

    var shippingCost = CalculateShippingCost(shippingDetails);

    return (ActionResult)new OkObjectResult(shippingCost);
}

public static ShippingCost CalculateShippingCost(ShippingDetails shippingDetails)
{
    // simulating doing important calculations...
    return new ShippingCost
    {
        Cost = (decimal)Random.NextDouble() * 50
    };
}

public class ShippingDetails
{
    public decimal PackageWidth { get; set; }
    public decimal PackageHeight { get; set; }
    public decimal PackageDepth { get; set; }
    public decimal PackageWeight { get; set; }
    public string RecipientPostCode { get; set; }
}

public class ShippingCost
{
    public decimal Cost { get; set; }
}