Monzo 0.11.0.21

Monzo.NET

Monzo.NET is a .NET client library for the Monzo bank API. Use it to build apps and view your accounts, balances and transactions, create feed items, manage webhooks and attachments, and more!

>>> Get Monzo.NET via NuGet

Install-Package Monzo

Supported target frameworks: .Net Core, .NET 4.5, ASP.NET Core 5.0, Windows 8, Windows Phone 8.1

Supported Features

• 100% async task-based API
• OAuth 2.0 authentication
• Web application flow (Authorization Code Grant)
• Native CLR types
• Access token refreshing
• Built for unit testing
• List accounts, transactions, and balances
• Create feed items
• Manage webhooks and attachments
• Upload attachments

Usage Examples

Authentication, Accounts, Balances, and Transactions

To authenticate using OAuth 2.0 Web application flow (Authorization Code Grant) and retrieve a list of accounts:

public class HomeController : Controller
{
    IMonzoAuthorizationClient _authClient = new MonzoAuthorizationClient(YOUR_CLIENT_ID, YOUR_CLIENT_SECRET);

    [HttpGet]
    public ActionResult Login()
    {
        // an unguessable random string which is used to protect against cross-site request forgery attacks
        string state = ...; 

        // the URL the user should be redirected back to following a successful Monzo login
        string redirectUrl = Url.Action("OAuthCallback", "Home", null, Request.Url.Scheme);

        string monzoLoginPageUrl = _authClient.GetAuthorizeUrl(state, redirectUrl);

        // 1. Send user to Monzo's login page
        return Redirect(monzoLoginPageUrl);
    }

    [HttpGet]
    public async Task<ActionResult> OAuthCallback(string code, string state)
    {
        // confirm the redirect url was valid
        string redirectUrl = Url.Action("OAuthCallback", "Home", null, Request.Url.Scheme);
    
        // 2. Exchange authorization code for access token
        AccessToken accessToken = await _authClient.GetAccessTokenAsync(code, redirectUrl);
            
        // 3. Begin fetching accounts, transactions etc
        using (var client = new MonzoClient(accessToken.Value))
        {
            IList<Account> accounts = await client.GetAccountsAsync();

            // ... etc
        }
    }
} 

Validating your API token

To check if your access token is valid and authenticated:

// List access token info
await client.WhoAmIAsync();

Feed Items

To create a feed item:

// create feed item
var parameters = new Dictionary<string, string>
{
    {"title", "My custom item"},
    {"image_url", "www.example.com/image.png"},
    {"background_color", "#FCF1EE"},
    {"body_color", "#FCF1EE"},
    {"title_color", "#333"},
    {"body", "Some body text to display"},
};

await client.CreateFeedItemAsync("myaccountid", "basic", parameters, "https://www.example.com/a_page_to_open_on_tap.html");

Webhooks

To register, delete and list webhooks:

// list webhooks
IList<Transaction> webhooks = await client.ListTransactionsAsync("myaccountid");

// register new webhook
Webhook webhook = await client.RegisterWebhookAsync("myaccountid", "http://example.com/webhook");

// delete webhook
await client.DeleteWebhookAsync(webhook.Id);

Attachments

To upload, register and remove transaction attachments:

// upload and register an attachment
using (var stream = File.OpenRead(@"C:\example.png"))
{
    Attachment attachment = await client.UploadAttachmentAsync("example.png", "image/png", transaction.Id, stream);
}

// register an attachment that is already hosted somewhere
Attachment attachment = await client.RegisterAttachmentAsync(transaction.Id, "http://example.com/pic.png", "image/png");

// remove attachment
await client.DeregisterAttachmentAsync(attachment.Id);

Refreshing your Access Token

OAuth 2.0 access tokens expire and must be periodically refreshed to maintain API access. Here is an example using an Rx IScheduler:

private _refreshDisposable = new SerialDisposable();

// schedule automatic token refresh
private void EnqueueRefresh()
{
     DateTimeOffset refreshTime = DateTimeOffset.UtcNow.AddSeconds(_accessToken.ExpiresIn);

    _refreshDisposable.Disposable = Scheduler.Default.Schedule(refreshTime, async () =>
    {
        await _authClient.RefreshAccessTokenAsync(_accessToken.RefreshToken);
        EnqueueRefresh();
    });
}

Samples

ASP.NET MVC

Check out the ASP.NET MVC Web Application Sample demonstrating OAuth 2.0 Web application flow (Authorization Code Grant):

https://github.com/rdingwall/MondoAspNetMvcSample

Universal Windows

Also the Universal Windows Sample application using Monzo.NET, Rx and MVVM:

https://github.com/rdingwall/MondoUniversalWindowsSample

Contributions

Contributions and pull requests are more than welcome! 🎁