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InvoicingAPI API = new InvoicingAPI("YOUR_API_KEY");

AddInvoiceResponse response = API.AddInvoice(new Model.Invoice() {
    Seller = new Model.Actor() {
        Name = "ACME Corporation",
    },
    Buyer = new Model.Actor() {
        Name = "My First Invoice Buyer"
    },
    Items = new List<Model.InvoiceItem>() {
         new Model.InvoiceItem() {
             Name = "My Product Name",
             UnitPrice = 20.01m,
             Quantity = 2,
             ItemTotalAmount = 40.02m
         } },
    Totals = new Model.InvoiceTotals() {  Total = 40.02m }
});
demo code
You can use test.invoicing.services environment to test the API.