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Nicola Iarocci
Nicola Iarocci

Posted on • Originally published at invoicetronic.com

How to upload SDI FatturaPA invoices with C#

#programming #tutorials #dotnet #csharp

In this tutorial we build a simple C# console application that connects and authenticates with the Invoicetronic API and uploads outbound invoices to SDI FatturaPA.

Before continuing, make sure all the prerequisites below are met.

Prerequisites

We assume that these prerequisites are met:

We use the dotnet tool and VS Code as they are available on most systems, but you can follow along with your favourite IDE (Visual Studio, Rider, etc.) if you prefer.

For an optimal C# experience in VS Code, you want to ensure that the C# Dev Kit extension is installed and enabled. For more information, see Getting Started with C# in VS Code.

Create the app

The first step is to create the application:

dotnet new console -n send
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The command created a new C# project named "quickstart" in a directory with the same name. Step into that directory:

cd send
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Install the SDK

Once in the quickstart directory, install the C# SDK:

 dotnet add package Invoicetronic.Sdk
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Once that's done, open VS Code in the current directory:

code .
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Click on the Program.cs file to see its contents in VS Code right pane.

Configure the SDK

Replace Program.cs default content with the following:

using Invoicetronic.Sdk.Api;
using Invoicetronic.Sdk.Client;
using Invoicetronic.Sdk.Model;

// Configure the SDK.
var config = new Configuration
{
    BasePath = "https://api.invoicetronic.com/v1",
    Username = "YOUR TEST API KEY (starts with ik_test_)"
};
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As you can see, we initialize a Configuration instance by setting the API's base path and your test API Key (not the live one). Notice how we use the Username property to set the API Key.

When you create your account, you obtain a pair of API Keys. One is the test key for the API Sandbox, and the other is the live API's. You can tell the difference because the former starts with ik_test_, while the latter begins with ik_live_. In this tutorial, always use the test key.

Send an invoice

We are ready to make a request. We want to send an invoice to the SDI. Add the following code:


// Send an invoice
var filePath = "/some/file/path/filename.xml";

var metaData = new Dictionary<string, string>
{
    { "internal_id", "123" },
    { "created_with", "myapp" },
    { "some_other_custom_data", "value" },
};

var sendApi = new SendApi(config);

try
{
    var sentInvoice = await sendApi.SendPostAsync(new Send()
    {
        FileName = Path.GetFileName(filePath),
        Payload = File.ReadAllText(filePath),
        MetaData = metaData
    });

    Console.WriteLine($"The invoice was sent successfully, it now has the unique Id of {sentInvoice.Id}.");
}
catch (ApiException e)
{
    Console.WriteLine($"{e.Message} - {e.ErrorCode}");
}
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Switch to the terminal and type:

dotnet run
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You should obtain an output similar to this one:

The invoice filename.xml was sent successfully, it now has the unique Id of 123.
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What we learned

In this example, we learned several things.

  1. We must configure the SDK by setting both the BasePath and Username properties, the latter initialized with the API key.

  2. We must instantiate a class representing the endpoint we want to work with. In this case, we leverage SendApi to send invoices. Endpoint classes like SendApi offer methods for interacting with their target entity. We call InvoiceV1SendPosttAsync to send an invoice.

  3. The Send class exposes valuable properties such as FileName, MetaData, and Payload. The last one contains the invoice content, while MetaData is optional and binds custom data to the document.

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