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Examples implementing with the Fidel API and Fidel SDKs using various languages and frameworks.


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Sample Application for Using the Fidel API and Web SDK

The application in this repository implements:

  • a Node.js Server that listens for webhook events coming from Fidel and passes them on to a WebSocket and provides an authentication layer for calling various Fidel APIs.
  • a React Client that receives transactions from the server via a WebSocket, can create test transactions using the server and Fidel APIs and link cards using the Fidel Web SDK.


If you want to run it locally, please start by cloning the repo to your local environment:

$ git clone


You'll need a few things before you can run this sample application locally:

Getting Started

Run ngrok

We are using ngrok to expose our locally running application server to the Fidel platform without deploying it in a hosted environment. After you've downloaded and installed ngrok, you'll need to run it on port 3000 because the application server is listening on that particular port.

$ ./ngrok http 3000

ngork will give you a random-looking URL, similar to Please make a note of it. You will use it to register webhooks in the Fidel Dashboard.

Register Webhooks

After you've signed up for a Fidel account, you'll notice it comes with demo data in a test sandbox. Your account has a "Demo Program", which we'll use with this sample application. We'll register webhooks on the demo program in the Fidel Dashboard. If you click on the program name on the main screen, you'll see a "Webhooks" option appear on the side menu. Choosing that option will take you to the Webhooks screen, where you can register a "New webhook".

This application server implements a generic catch-all webhook route in /api/webhooks/:type. By appending the ngrok URL you got earlier, you can register any of the webhooks supported in the Fidel Dashboard.

We recommend you register at least 2 webhooks, transaction.auth and transaction.clearing, the sample application client in this repository is using them. The Webhook URLs should be similar to and

Run the Application

First, let's install the project dependencies for the client:

$ npm install

And the server:

$ cd server
$ npm install
$ cd ../

Then, we'll need to create an environment file and populate the Fidel API Key and Fidel SDK Key.

$ cp example.env .env

Add your Fidel Test keys in the newly created .env file. You'll find both keys in the Account page of the Fidel Dashboard. Please use the Test keys. They'll start with sk_test_ for the API key and pk_test_ for the SDK key.

That's it, you're ready to run the sample application:

$ npm start

Use the Application

After you've run the sample application, a browser window will open to http://localhost:3001/. You can add cards, create transactions, and see transactions appear in real-time in the UI. You can also clear authorized transactions in the same UI.


Examples implementing with the Fidel API and Fidel SDKs using various languages and frameworks.








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