public class Transaction
{
    [JsonProperty(Order = 1, NullValueHandling = NullValueHandling.Include, PropertyName = "sender")]
    public string Sender { get; set; }

    [JsonProperty(Order = 2, NullValueHandling = NullValueHandling.Include, PropertyName = "recipient")]
    public string Recipient { get; set; }

    [JsonProperty(Order = 3, NullValueHandling = NullValueHandling.Include, PropertyName = "amount")]
    public int Amount { get; set; }
}