E-sign with C# & .NET

using Anvil.Client;
using Anvil.Payloads.Request.Types;

class SignExample
{
    static async Task Main(string[] args)
    {
        var apiKey = Environment.GetEnvironmentVariable("ANVIL_API_KEY");

        // A sample PDF template available to any account. See
        // https://www.useanvil.com/help/tutorials/set-up-a-pdf-template to
        // set up your own template.
        var pdfTemplateEid = "05xXsZko33JIO6aq5Pnr";

        var signerName = "Testy Signer";
        var signerEmail = args.Length > 0 ? args[0] : "";

        var payload = new Anvil.Payloads.Request.CreateEtchPacket
        {
            // The packet is ready to send: an email goes to the first
            // signer. Use IsDraft = true to review it in the dashboard
            // first
            IsDraft = false,

            // Test packets use development signatures and do not count
            // toward your billed packets
            IsTest = true,

            Name = "Test Docs - " + signerName,
            SignatureEmailSubject = "Custom email subject",
            SignatureEmailBody = "Custom please sign these documents....",

            Files = new IEtchPacketAttachable[]
            {
                new EtchCastRef()
                {
                    // Your own ID for referencing this file in Data and
                    // Signers below
                    Id = "sampleTemplate",
                    CastEid = pdfTemplateEid,
                },
            },

            Signers = new EtchSigner[]
            {
                // Signers sign in the order they are specified
                new()
                {
                    Id = "signer1",
                    Name = signerName,
                    Email = signerEmail,
                    SignerType = "email",

                    // The fields this signer clicks through, in this order
                    Fields = new SignerField[]
                    {
                        new()
                        {
                            FileId = "sampleTemplate",
                            FieldId = "signature",
                        },
                    },
                },
            },

            // This data fills the PDF before it is sent to any signers.
            // IDs here match the fields configured on the PDF template
            Data = new
            {
                Payloads = new
                {
                    sampleTemplate = new
                    {
                        data = new Dictionary<string, dynamic>
                        {
                            {"name", signerName},
                            {"email", signerEmail},
                        }
                    },
                },
            },
        };

        var client = new GraphQLClient(apiKey);
        var response = await client.CreateEtchPacket(payload);

        // The response's CreateEtchPacket member is a dynamic object;
        // fields use the API's camelCase names
        Console.WriteLine("Visit the new packet on your dashboard: "
            + response.CreateEtchPacket["detailsURL"]);
    }
}