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gcatanese authored Feb 5, 2024
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* Set the `ADYEN_API_KEY`, `ADYEN_CLIENT_KEY`, `ADYEN_HMAC_KEY` and `ADYEN_MERCHANT_ACCOUNT variables`.
* Click the button below!

[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/adyen-examples/adyen-golang-online-payments)
_NOTE: To allow the Adyen Drop-In and Components to load, you have to add `https://*.gitpod.io` as allowed origin for your chosen set of [API Credentials](https://ca-test.adyen.com/ca/ca/config/api_credentials_new.shtml)_

_NOTE: To allow the Adyen Drop-In and Components to load, you have to add `https://*.gitpod.io` as allowed origin for your chosen set of [API Credentials](https://ca-test.adyen.com/ca/ca/config/api_credentials_new.shtml)_

[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/adyen-examples/adyen-golang-online-payments)
 [First time with Gitpod?](https://github.com/adyen-examples/.github/blob/main/pages/gitpod-get-started.md)

## Details

This repository includes examples of PCI-compliant UI integrations for online payments with Adyen. Within this demo app, you'll find a simplified version of an e-commerce website, complete with commented code to highlight key features and concepts of Adyen's API. Check out the underlying code to see how you can integrate Adyen to give your shoppers the option to pay with their preferred payment methods, all in a seamless checkout experience.
This repository showcases a PCI-compliant integration of the [Sessions Flow](https://docs.adyen.com/online-payments/build-your-integration/additional-use-cases/), the default integration that we recommend for merchants. Explore this simplified e-commerce demo to discover the code, libraries and configuration you need to enable various payment options in your checkout experience.

![Card checkout demo](static/images/cardcheckout.gif)

## Supported Integrations

[Online payments](https://docs.adyen.com/online-payments) **Golang + Gin Gonic** demos of the following client-side integrations are currently available in this repository:

- Drop-in
- Components
- ACH
- Card (3DS2)
- Dotpay
- giropay
- iDEAL
- Klarna (Pay now, Pay later, Slice it)
- SOFORT

Each demo leverages Adyen's API Library for Golang ([GitHub](https://github.com/Adyen/adyen-go-api-library) | [Docs](https://docs.adyen.com/development-resources/libraries#go)).
The demo leverages Adyen's API Library for Golang ([GitHub](https://github.com/Adyen/adyen-go-api-library) | [Docs](https://docs.adyen.com/development-resources/libraries#go)).

## Requirements

Golang 1.14+
Golang 1.19+

## Installation

Expand Down Expand Up @@ -75,82 +63,29 @@ go run -v .

To try out integrations with test card numbers and payment method details, see [Test card numbers](https://docs.adyen.com/development-resources/test-cards/test-card-numbers).

## Run in Docker

Alternatively you can build and run a Docker image

```
# Build image locally
docker build -t adyen/golang-online-payments .
# Run image passing env variables
docker run --rm -e "PORT=8080" -e "ADYEN_API_KEY=abc123" -e "ADYEN_MERCHANT_ACCOUNT=TestAccount123" -e "ADYEN_CLIENT_KEY=tyu123" --name adyen-golang-online-payments -p 8080:8080 adyen/golang-online-payments
```

## Testing webhooks

Webhooks deliver asynchronous notifications and it is important to test them during the setup of your integration. You can find more information about webhooks in [this detailed blog post](https://www.adyen.com/blog/Integrating-webhooks-notifications-with-Adyen-Checkout).

This sample application provides a simple webhook integration exposed at `/api/webhooks/notifications`. For it to work, you need to:
# Webhooks

1. Provide a way for the Adyen platform to reach your running application
2. Add a Standard webhook in your Customer Area
Webhooks deliver asynchronous notifications about the payment status and other events that are important to receive and process.
You can find more information about webhooks in [this blog post](https://www.adyen.com/knowledge-hub/consuming-webhooks).

### Making your server reachable
### Webhook setup

Your endpoint that will consume the incoming webhook must be publicly accessible.

There are typically 3 options:
* deploy on your own cloud provider
* deploy on Gitpod
* expose your localhost with tunneling software (i.e. ngrok)

#### Option 1: cloud deployment
If you deploy on your cloud provider (or your own public server) the webhook URL will be the URL of the server
```
https://{cloud-provider}/api/webhooks/notifications
```

#### Option 2: Gitpod
If you use Gitpod the webhook URL will be the host assigned by Gitpod
```
https://myorg-myrepo-y8ad7pso0w5.ws-eu75.gitpod.io/api/webhooks/notifications
```
**Note:** when starting a new Gitpod workspace the host changes, make sure to **update the Webhook URL** in the Customer Area

#### Option 3: localhost via tunneling software
If you use a tunneling service like [ngrok](ngrok) the webhook URL will be the generated URL (ie `https://c991-80-113-16-28.ngrok.io`)

```bash
$ ngrok http 8080

Session Status online
Account ############
Version #########
Region United States (us)
Forwarding http://c991-80-113-16-28.ngrok.io -> http://localhost:8080
Forwarding https://c991-80-113-16-28.ngrok.io -> http://localhost:8080
```
In the Customer Area under the `Developers → Webhooks` section, [create](https://docs.adyen.com/development-resources/webhooks/#set-up-webhooks-in-your-customer-area) a new `Standard webhook`.

**Note:** when restarting ngrok a new URL is generated, make sure to **update the Webhook URL** in the Customer Area
A good practice is to set up basic authentication, copy the generated HMAC Key and set it as an environment variable. The application will use this to verify the [HMAC signatures](https://docs.adyen.com/development-resources/webhooks/verify-hmac-signatures/).

### Set up a webhook
Make sure the webhook is **enabled**, so it can receive notifications.

* In the Customer Area go to Developers -> Webhooks and create a new 'Standard notification' webhook.
* Enter the URL of your application/endpoint (see options [above](#making-your-server-reachable))
* Define username and password for Basic Authentication
* Generate the HMAC Key
* Optionally, in Additional Settings, add the data you want to receive. A good example is 'Payment Account Reference'.
* Make sure the webhook is **Enabled** (therefore it can receive the notifications)
### Expose an endpoint

That's it! Every time you perform a new payment, your application will receive a notification from the Adyen platform.
This demo provides a simple webhook implementation exposed at `/api/webhooks/notifications` that shows you how to receive, validate and consume the webhook payload.

## Contributing
### Test your webhook

We commit all our new features directly into our GitHub repository. Feel free to request or suggest new features or code changes yourself as well!
The following webhooks `events` should be enabled:
* **AUTHORISATION**

Find out more in our [Contributing](https://github.com/adyen-examples/.github/blob/main/CONTRIBUTING.md) guidelines.

## License
To make sure that the Adyen platform can reach your application, we have written a [Webhooks Testing Guide](https://github.com/adyen-examples/.github/blob/main/pages/webhooks-testing.md)
that explores several options on how you can easily achieve this (e.g. running on localhost or cloud).

MIT license. For more information, see the **LICENSE** file in the root directory.

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