AtolOnlineNet

dotnet add package AtolOnlineNet

using AtolOnlineNet;
using AtolOnlineNet.V1_05;

var options = new AtolOnlineClientOptions
{
    Login = "your-login",
    Password = "your-password",
    GroupCode = "your-group-code",
    BaseAddress = AtolOnlineClientOptions.TestBaseAddress,
};

using var client = new AtolOnlineClient(options);

var registered = await client.SellAsync(new ReceiptRegistrationRequest
{
    ExternalId = Guid.NewGuid().ToString("N"),
    Timestamp = DateTime.Now,
    Receipt = receipt, // items, payments, company, client
});

var report = await client.GetReportAsync(registered.Uuid!);