Accept PayU with UI components

Use Unzer UI component to add PayU payment to your checkout page.

Overview

Using UI components for PayU you get a ready-made form with the fields necessary to make this type of payment. You can check a demo version of the component. Basic steps for integrating using UI components are the same for all payment methods and you can read about them here.

Before you begin

Check the basic integration requirements.
Familiarize yourself with general guide on integrating using UI components.

Step 1: Add UI components to your payment page
client side

First, you need to initiate our UI components library and add the payment form to your payment page.

Initiate UI component

Load our JS script and CSS stylesheet

Include Unzer’s script and stylesheet on your website.

Always load the script and stylesheet directly from Unzer:

<link rel="stylesheet" href="https://static.unzer.com/v1/unzer.css" />
<script type="text/javascript" src="https://static.unzer.com/v1/unzer.js"></script>

Faster load time
To make your website load faster, insert JavaScript scripts at the bottom of your HTML document.

Importing Unzer styles
To minimize the risk of Unzer styles affecting the styles of your webpage, we suggest putting unzer.css on top of other imported CSS files.

Create an Unzer instance

Create an unzer instance with your public key:

// Creating an unzer instance with your public key
var unzerInstance = new unzer('s-pub-xxxxxxxxxx');

Placeholder keys
In the previous example, we used a placeholder API key for example purposes. You should replace it with your public key.

Localization and languages

We support localization with locale option parameters. Check the Localization page for a list of all the supported locales.

The auto option (applied by default) uses the client’s browser language.

Here you can see how to set the language, in our case ‘de-DE’ - to do so, add a comma separated parameter to your unzer instance:

// Creating an unzer instance with your public key
var unzerInstance = new unzer('s-pub-xxxxxxxxxx', {locale: 'de-DE'});

Implement the payment form

Because no additional data is required for this payment method, you just need to create a simple HTML button on the client side:

<form id="payment-form" class="unzerUI form" novalidate>
    <div id="error-holder" class="field" style="color: #9f3a38">
        <!-- Errors will be inserted here -->
    </div>
    <button class="unzerUI primary button fluid" id="submit-button" type="submit">Pay</button>
</form>

Matching IDs

When choosing your ID for a UI component, make sure that the names in your HTML and JavaScript match.

For example:

<div id="payment-form"> matches the ID used in the script: "payment-form".

Create a payment type resource

To create a payment type resource – a PayU instance, call the unzerInstance.PayU() method:

// Creating an PayU instance
var payU = unzerInstance.PayU()

Add an event listener for “submit” of the form.

Inside, create a Promise on the payU object. The Promise is either resolved or rejected:

let form = document.getElementById('payment-form');
form.addEventListener('submit', function(event) {
    event.preventDefault();

    payU.createResource()
        .then(function(result) {
            // Submit the id of the created payment type to your
            // backend to perform the payment transaction with it.
            typeId = result.id;
        })
        .catch(function(error) {
            // handle errors
            document.getElementById('error-holder').innerText = error.customerMessage || error.message || 'Error'
        })
});

Optional: Customize the UI Components

You can easily customize the font of the forms by changing the options within the create method. Here you can set the following styles: fontSize, fontColor and fontFamily.

bancontact.create('holder', {
    containerId: 'bancontact-holder',
    fontSize: '16px',
    fontColor: 'lightgrey',
    fontFamily: 'Arial, Helvetica, sans-serif'
});

Step 2: Make a payment
server side

Make a charge transaction

Now, make a charge transaction with the payu typeId that you created in step 1 and the returnUrl leading back to your shop after the payment is finished on the external page. With the charge transaction, an amount is requested but is not yet transferred. Initially the transaction will be pending and a payment resource is created.

POST https://api.unzer.com/v1/payments/charges
{
  "amount" : "1",
  "currency" : "PLN",
  "returnUrl": "https://www.unzer.com",
  "resources" : {
    "typeId" : "s-pyu-mnzdgnjmuane",
      "customerId": "s-cst-041fbdedbb9b"
  }
}

$unzer     = new UnzerSDK\Unzer('s-priv-xxxxxxxxxx');

$charge = new Charge(100.00, 'PLN', 'https://www.my-shop-url.de/returnhandler');
$typeId = 's-pyu-3qujdbdjas5w';

$unzer->performCharge($charge, $typeId);

Unzer unzer = new Unzer("s-priv-xxxxxxxxxx");

Charge charge = (Charge) new Charge()
        .setAmount(BigDecimal.valueOf(190.00))
        .setCurrency(Currency.getInstance("PLN"))
        .setTypeId("s-pyu-zex7c9iibpek")
        .setReturnUrl(unsafeUrl("https://www.my-shop-url.de/returnhandler");

unzer.charge(charge);

The response looks similar to the following example:

{
    "id": "s-chg-1",
    "isSuccess": false,
    "isPending": true,
    "isResumed": false,
    "isError": false,
    "card3ds": false,
    "redirectUrl": "https://payment.unzer.com/v1/redirect/payu/s-dsm7nSlWTBee",
    "message": {
        "code": "COR.000.000.000",
        "merchant": "Transaction succeeded",
        "customer": "Your payments have been successfully processed."
    },
    "amount": "1.0000",
    "currency": "PLN",
    "returnUrl": "https://www.unzer.com",
    "date": "2023-08-23 09:41:29",
    "resources": {
        "customerId": "s-cst-041fbdedbb9b",
        "paymentId": "s-pay-2",
        "traceId": "8843268aa44e31f6f8cef582ae5bcea9",
        "typeId": "s-pyu-mnzdgnjmuane"
    },
    "paymentReference": "",
    "processing": {
        "uniqueId": "6925139e.a763.495e.bbd2.6ee3679834bf",
        "shortId": "2226.5195.0176",
        "traceId": "8843268aa44e31f6f8cef582ae5bcea9"
    }
}

For a full description of the charge transaction, refer to the relevant server-side integration documentation page: Charge a payment (direct API calls), Charge a payment (PHP SDK), Charge a payment (Java SDK).

Step 3: Check status of the payment
server side

Once the customer is redirected to the returnUrl, you can fetch the payment details from the API, by using the resources.paymentId from the charge response above to handle the payment according to its status. If the status of the payment is completed , the payment process has been finished successfully and can be considered as paid. Check all possible payment states here.

GET: https://api.unzer.com/v1/payments/s-pay-2
{
    "id": "s-chg-1",
    "isSuccess": true,
    "isPending": false,
    "isResumed": false,
    "isError": false,
    "card3ds": false,
    "redirectUrl": "",
    "message": {
        "code": "COR.000.000.000",
        "merchant": "Transaction succeeded",
        "customer": "Your payments have been successfully processed."
    },
    "amount": "1.0000",
    "currency": "PLN",
    "returnUrl": "https://www.unzer.com",
    "date": "2023-08-23 09:41:29",
    "resources": {
        "customerId": "s-cst-041fbdedbb9b",
        "paymentId": "s-pay-2",
        "basketId": "",
        "metadataId": "",
        "payPageId": "",
        "traceId": "8843268aa44e31f6f8cef582ae5bcea9",
        "typeId": "s-pyu-mnzdgnjmuane"
    },
    "paymentReference": "",
    "processing": {
        "uniqueId": "eef44197.5aa5.444d.b169.797fa2a8dd5f",
        "shortId": "2226.5668.2560",
        "traceId": "8843268aa44e31f6f8cef582ae5bcea9"
    }
}

<h2 id="step-4-display-the-payment-result-client-side">Step 4: Display the payment result <div class='uds-tag uds-raspberry'>client side</div></h2>

Use the information from the Check status of the payment step to display the payment result to your customer.
This can be the success or error page of your shop. If something went wrong, you can use the client message from the API response and show it to the customer.

Manage payment
server side

For more details on managing PayU payments, such as refunding them, see Manage PayU payments.

Notifications

We recommend subscribing to the payment event to receive notifications about any changes to the payment resource. As soon as the event is triggered you should fetch the payment and update the order status in your shop according to its status.

  {
    "event":"payment.pending",
    "publicKey":"s-pub-xxxxxxxxxx",
    "retrieveUrl":"https://api.unzer.com/v1/payments/s-pay-774",
    "paymentId":"s-pay-774"
  }

For more details on implementing webhooks to receive notifications, see Notifications page.

Error handling

All requests to the API can result in an error that should be handled. Refer to the Error handling guide to learn more about Unzer API (and other) errors and handling them.

Test & go live

You should always test your integration before going live. First perform test transactions using test data. Next, check against Integration checklist and Go-live checklist to make sure the integration is complete and you’re ready to go live.

Important information