Install-Package issuu.Client

public override void ConfigureServices(IServiceCollection services)
{
    services.AddIssuuClient(options =>
    {
        options.Credentials.ApiKey = "your-api-key";
        options.Credentials.ApiSecret = "your-api-secret";
    });
}

public class MyTest
{
    private readonly IssuuClient _client;

    public MyClient(IssuuClient client)
    {
        _client = client;
    }

    public async Task ExecuteAsync()
    {

        var response = await _client.GetDocumentsAsync(o =>
        {
            o.PageSize = 20;
            o.StartIndex = 0;
        });

        foreach (var result in response.Results)
        {
            Console.WriteLine(result.Document.Title);
        }

    }
}