C# (pronounced as C sharp) is a general-purpose, object-oriented programming language. It is one of the most popular languages used for developing desktop and web applications.

You can easily integrate crypto payments into your own website or app with our UniPayment .Net SDK, after installation you can start accepting crypto-payments.

UniPayment .Net Client

GitHub license NuGet version (BitPay.Light)

A .NET client for the UniPayment Client API.

This SDK provides a convenient abstraction of UniPayment's Gateway API and allows developers to focus on payment flow/e-commerce integration rather than on the specific details of client-server interaction using the raw API.

Getting Started

Before using the UniPayment API, sign up for your API key.

If you want to use the Sandbox, sign up here.



  1. Download the package and extract it into a local directory or clone the repo.
  2. Add reference from your project.

Using Nuget

nuget install UniPayment.Client

Initializing UniPayment client

using UniPayment.Client;

client = UniPaymentClient(AppId, ApiKey);

Sandbox is used in the same way with is_sandbox as true.

using UniPayment.Client;

client = UniPaymentClient(AppId, ApiKey);

Create an invoice


using UniPayment.Client;
using UniPayment.Client.Models;

app_id="your app id"
api_key="your api key"

var request = new CreateInvoiceRequest();
request.PriceAmount = 2.00f;
request.PriceCurrency = "USD";
request.NotifyURL = "https://demo-payment.requestcatcher.com/test";
request.RedirectURL = "https://www.example.com";
request.OrderId = "ORDER_123456";
request.Title = "MacBook Pro";
request.Description = "MacBook Pro(256G)";
request.Lang = "en-US";
request.ExtArgs = "Merchant Pass Through Data";
request.ConfirmSpeed = "Medium";

var response = _client.CreateInvoice(request);


  "code": "OK",
  "msg": "",
  "data": {
    "app_id": "cee1b9e2-d90c-4b63-9824-d621edb38012",
    "invoice_id": "Dj2mNCXXWCGKT89kcU8NJn",
    "order_id": "ORDER_123456",
    "price_amount": 2.0,
    "price_currency": "USD",
    "network": null,
    "address": null,
    "pay_amount": 0.0,
    "pay_currency": null,
    "exchange_rate": 0.0,
    "paid_amount": 0.0,
    "create_time": "2022-09-14T06:31:57",
    "expiration_time": "2022-09-14T06:36:57",
    "confirm_speed": 2,
    "status": 1,
    "error_status": 0,
    "invoice_url": "https://sandbox-app.unipayment.io/i/Dj2mNCXXWCGKT89kcU8NJn"

Handle IPN


Invoice Status: https://unipayment.readme.io/reference/invoice-status

IPNs (Instant Payment Notifications) are sent to the notify_url when order status is changed to paid, confirmed and complete.

public async Task<string> Post()
    var notify = await new StreamReader(Request.Body).ReadToEndAsync();

    var client = new UniPaymentClient(_appId, _apiKey, true);
    var result = await client.CheckIPNAsync(notify);
    return Newtonsoft.Json.JsonConvert.SerializeObject(result);

IPN notify

    "ipn_type": "invoice",
    "event": "invoice_expired",
    "app_id": "cee1b9e2-d90c-4b63-9824-d621edb38012",
    "invoice_id": "3Q7fyLnB2YNhUDW1fFNyEz",
    "order_id": "20",
    "price_amount": 6.0,
    "price_currency": "SGD",
    "network": null,
    "address": null,
    "pay_currency": null,
    "pay_amount": 0.0,
    "exchange_rate": 0.0,
    "paid_amount": 0.0,
    "confirmed_amount": 0.0,
    "refunded_price_amount": 0.0,
    "create_time": "2022-09-12T03:36:03",
    "expiration_time": "2022-09-12T03:41:03",
    "status": "Expired",
    "error_status": "None",
    "ext_args": null,
    "transactions": null,
    "notify_id": "8ccd2b61-226b-48e5-99b8-acb1f350313e",
    "notify_time": "2022-09-12T03:56:10.5852752Z"

Run Example

1.Get source code form GitHub

git clone https://github.com/UniCryptoLab/UniPaymentClient.NetCore.git

2.Build and run UniPayment.Client.Examle