Accept Unzer Direct Debit with UI components v2

Beta

Use Unzer UI component to add Unzer Direct Debit payment to your checkout page.

Overview

Using UI components v2 for Unzer Direct Debit, you can create a paylater-direct-debit payment type resource that is used to make the payment. The form of this payment type consists of the IBAN, Account holder, and a birth date input fields.

Basic steps for integrating using UI components are the same for all payment methods, and you can read about them here.

With Unzer Direct Debit you need to provide information about the customer via a customer resource and the purchased products via a basket resource when you make the transaction. This is required for customer assessment and transaction approval. You will also need the customer information to create the invoice document. You are responsible for gathering this data during the checkout.

Before you begin

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

Step 1: Add UI components v2 to your payment page
client side

First, you need to initiate our UI components v2 library and add the needed payment type component to your payment page.

Initiate UI Components

Load the Unzer JS script

Include the Unzer JS script on your website. This will load all the Unzer custom UI components, prefixed with unzer- e.g <unzer-paylater-invoice>.

Make sure to always include the script directly from the Unzer domain https://static.unzer.com

<script
        type="module"
        src="https://static.unzer.com/v2/ui-components/index.js"
></script>

Faster load time

To make your website load faster, import the unzer script at the bottom of your HTML document.

Make sure to import the script as type=“module”

Content security policy
To learn which URLs must be added to the allowlist for Unzer UI components in your content security policy, please refer to Content security policy section.

It is a good practice to put your website in loading state until the Unzer script is loaded, and the UI components are ready to use.

    // Make sure initially your application is in loading state
    // until all Unzer components are loaded
    Promise.all([
        customElements.whenDefined("unzer-payment"),
        // Probably add any other Unzer components used here. For example:
        // customElements.whenDefined("unzer-paylater-invoice"),
    ]).then(() => {
        // Hide the loading state and proceed with next steps
    }).catch((error) => {
        // Handle any error that might occur during the 
        // loading process and initialization
    });

UI setup and configuration

To securely collect payment data from your customer, you need to add the <unzer-payment> component, inside which you insert the needed payment type components.

We recommend putting your submit button inside the <unzer-checkout> element. This will provide automatic handling for enabling/disabling the submit button depending on the current status, and showing/hiding of brand icons.

<unzer-payment
        id="unzer-payment"
        publicKey="s-pub-xyz"
        locale="de-DE">
    <!-- ... Here you will need to add the Unzer payment type tag, so the form UI elements will be inserted -->
    <!--    e.g <unzer-paylater-invoice></unzer-paylater-invoice> -->
</unzer-payment>
<unzer-checkout id='unzer-checkout'>
    <button type="submit" id="yourPaymentButtonId">Pay</button>
</unzer-checkout>

Following parameters need to be passed.

Parameter	Type	Description	Default value
`publicKey` (required)	`String`	The merchant public key.	`-`
`locale`	`String`	The used locale. For more information on supported locales, see Localization.	Browser user defined locale.
`initData`	`object`	A key/value object in JSON-format containing data to initialize the payment type. For more information, Check payment methods and their features.	Empty object `{}`

Optional: Customize UI components

Our UI Components v2 are provided with a default theme that contains base styles. You can easily customize these styles by overriding the following CSS variables.

Variable name	Description	Affected components
`--unzer-font`	Replaces all fonts with the given font. Users can define any font-face and provide the name of the custom font-face.	typography
`--unzer-text-color`	The font color use for typography.	typography, icons
`--unzer-brand-color`	The main color of the application.	button, checkbox, radio, loader
`--unzer-background-color`	The page background.
`--unzer-link-color`	The color of links.	link
`--unzer-corner-radius`	Whether controls will have rounded corners or not. Values can be either 0 or 1.	button, tags, chips
`--unzer-shadows`	Whether shadows are enabled or not. Values can be either 0 or 1.	button, card

<head>
    <style>
        :root {
            --unzer-font: SFMono;
            --unzer-brand-color: #ee1818;
            --unzer-text-color: #f19316;
            --unzer-background-color: #6a9472;
            --unzer-link-color: #1330ef;
            --unzer-corner-radius: 0;
            --unzer-shadows: 1;
        }
    </style>
</head>

Implement the payment form

First you need to insert the Unzer Direct Debit <unzer-paylater-direct-debit> inside the <unzer-payment> and add your submit button.

<unzer-payment
        id="unzer-payment"
        publicKey="s-pub-xyz"
        locale="de-DE">
        <unzer-paylater-direct-debit></unzer-paylater-direct-debit>
</unzer-payment>
<unzer-checkout id='unzer-checkout'>
    <button type="submit" id="yourPaymentButtonId">Pay</button>
</unzer-checkout>

In case you want also to create/update your customer information, then you will need to use our Unzer UI customer elements.

Option 1: Implement with customer elements

If you don’t have information about the customer (and the corresponding customerID) or want to update information of an already existing customer, you can do so using Unzer UI customer elements.

Customer element	Description
`<unzer-personal-info>`	Adds the customer personal information (email, salutation, firstname, lastname)
`<unzer-shipping-address>`	Adds the customer shipping address information (country, street, post code, city, mobile number)
`<unzer-billing-address>`	Adds the customer billing address information (firstname, lastname, country, street, post code, city).

The Unzer UI customer elements can be inserted either inside or outside the <unzer-payment> element. On submit, all data from the added Unzer UI customer elements will be gathered and submitted together with the payment form, in order to create the customer and payment type resources.

In case you wish to initialize the customer elements with the data of an already created customer, you will need to call the setCustomerData() function of the <unzer-payment> element, and pass a customer object in JSON format.

customer object

Parameter	Type	Description	Default value
`id`	`String`	The ID of the customer you wish to update. If not passed, then a new customer will be created.
`salutation`	`String`	The salutation for the customer. Allowed values are: `"mr"`, `"mrs"`, `"diverse"`	`"mr"`
`firstname`	`String`	The first name of the customer.	`""`
`lastname`	`String`	The last name of the customer.	`""`
`birthDate`	`String`	The birth date of the customer.	`""`
`email`	`String`	The E-mail of the customer.	`""`
`mobileNumber`	`mobileNumber Object`	The mobile number	`{}`
`shippingAddress`	`address object`	The shipping address for the customer in JSON format.	`{}`
`billingAddress`	`address object`	The billing address for the customer in JSON format.	`{}`

address object

Parameter	Type	Description	Default value
`name`	`String`	The firstname + lastname of the customer	`""`
`street`	`String`	The street and house number	`""`
`zip`	`String`	The zip-code	`""`
`city`	`String`	The city	`""`
`state`	`String`	The state	`""`
`country`	`String`	The country ISO country code ISO 3166 ALPHA-2	`"DE"`
`shippingType` only in `shippingAddress`	`String`	The shippingType. Allowed values are: `"equals-billing"`, `"different-address"`, `"branch-pickup"`, `"post-office-pickup"`, `"pack-station"`	`"DE"`

mobileNumber object

Parameter	Type	Description	Default value
`prefix`	`String`	The country prefix of the mobile number	`""`
`phone`	`String`	The mobile number	`""`

The following code example shows the options described above:

    <unzer-payment
            id="unzer-payment"
            publicKey="s-pub-xyz"
            locale="de-DE">
            <unzer-paylater-direct-debit></unzer-paylater-direct-debit>
    </unzer-payment>
    
    <p>Shipping Information</p>
    <unzer-personal-info></unzer-personal-info>
    <unzer-shipping-address></unzer-shipping-address>
    
    <p>Billing Information</p>
    <unzer-billing-address></unzer-billing-address>

    <unzer-checkout id='unzer-checkout'>
        <button type="submit" id="yourPaymentButtonId">Pay</button>
    </unzer-checkout>

    const unzerPaymentElement = document.getElementById('unzer-payment');
    unzerPaymentElement.setCheckOutType("full");
    unzerPaymentElement.setCustomerData({
        "id": "s-cst-xyz",
        "lastname": "Universum",
        "firstname": "Peter",
        "salutation": "mr",
        "birthDate": "20.12.1987",
        "mobileNumber": {
            "prefix": "49",
            "phone": "1234"
        },
        "shippingAddress": {
            "name": "Peter Universum",
            "street": "Hugo-Junkers-Str. 5",
            "zip": "60386",
            "city": "Frankfurt am Main",
            "country": "DE",
            "shippingType": "equals-billing"
        },
        "billingAddress": {
           "state": "Peter Universum",
           "street": "Hugo-Junkers-Str. 5",
            "zip": "60386",
            "city": "Frankfurt am Main",
            "country": "DE"
        }
    })

Option 2: Create the customer on the server side

You can also use the customer data provided by your shop system to create the customer resource on the server side. This way you can omit rendering the customer form in the front end and just create the resource and use the ID in your transaction request.

In that case you just need to render the payment type form and create a simple HTML button on the client side.

Create Payment Type and Customer Resources

After the submit button is clicked, the customer and payment data are automatically submitted. You will then need to query the unzer-checkout element and handle the response inside its onPaymentSubmit event listener.

The following code example shows how to read customer and payment data from the response.

    // ...
    const unzerCheckout = document.getElementById('unzer-checkout');
    unzerCheckout.onPaymentSubmit = (response) => {
        if (response.submitResponse && response.customerResponse) {
            if (response.customerResponse.success) {
                // Optional: Only in case a new customer is created in the frontend.
                const customerId = response.customerResponse.data.id;
            }

            if (response.submitResponse.success) {
                const paymentTypeId = response.submitResponse.data.id;
            }

            // Submit all IDs to your server-side integration to perform the payment transaction.
        }
    };

Step 2: Make a payment
server side

Make a charge transaction

Now, make a charge transaction with the SepaDirectDebit typeId that you created in the frontend. With a successful charge transaction money is transferred from the customer to the merchant and a payment resource is created.

POST https://api.unzer.com/v1/payments/charges
   
Body:
{
  "amount": "20",
  "currency": "EUR",
  "resources": {
      "typeId": "s-sdd-zquetx73qvpm"
  }
}

$unzer = new Unzer('s-priv-xxxxxxxxxx');
$sepa-direct-debit = $unzer->fetchPaymentType('s-sdd-zquetx73qvpm');
$charge = $sepa-direct-debit->charge(20.0, 'EUR');

Unzer unzer = new Unzer("s-priv-xxxxxxxxxx");
Charge charge = unzer.charge(BigDecimal.ONE, Currency.getInstance("EUR"), "s-sdd-zquetx73qvpm");

The response looks similar to the following example:

{
    "id": "s-chg-1",
    "isSuccess": true,
    "isPending": false,
    "isError": false,
    "message": {
        "code": "COR.000.100.112",
        "merchant": "Request successfully processed in 'Merchant in Connector Test Mode'",
        "customer": "Your payments have been successfully processed in sandbox mode."
    },
    "amount": "20.0000",
    "currency": "EUR",
    "returnUrl": "",
    "date": "2021-05-10 15:29:09",
    "resources": {
        "paymentId": "s-pay-133634",
        "traceId": "bbaeefa04492a6bd033845de78b1f774",
        "typeId": "s-sdd-zquetx73qvpm"
    },
    "paymentReference": "",
    "processing": {
        "creatorId": "13213213344324324",
        "identification": "4851.9174.9801",
        "iban": "DE89*************3000",
        "bic": "CO******XX",
        "uniqueId": "31HA07BC813E8DE2B6D6096556538A37",
        "shortId": "4851.9174.9801",
        "traceId": "bbaeefa04492a6bd033845de78b1f774"
    }
}

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/{payment_ID}

{
  "id": "s-pay-xxxx",
  "state": {
    "id": 1,
    "name": "completed"
  },
  "amount": {
    "total": "119.0000",
    "charged": "119.0000",
    "canceled": "0.0000",
    "remaining": "0.0000"
  },
  "currency": "EUR",
  "orderId": "My Order Id",
  "invoiceId": "",
  "resources": {
    "customerId": "",
    "paymentId": "s-pay-xxxx",
    "basketId": "",
    "metadataId": "",
    "payPageId": "",
    "traceId": "e4c4fb1c81d2167eb86eb5a68cfb7760",
    "typeId": "s-sdd-xxxxxxxxxxx"
  },
  "transactions": [
    {
      "date": "2021-05-27 11:45:46",
      "type": "charge",
      "status": "success",
      "url": "https://api.unzer.com/v1/payments/s-pay-xxxx/charges/s-chg-1",
      "amount": "119.0000"
    }
  ]
}

Step 4: Display the payment result
client side

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 Unzer Direct Debit payments, such as refunding them, see Manage Unzer Direct Debit 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

Accept Unzer Direct Debit with UI components v2

Overview

Before you begin

Step 1: Add UI components v2 to your payment page
client side

Initiate UI Components

Load the Unzer JS script

UI setup and configuration

Optional: Customize UI components

Implement the payment form

Option 1: Implement with customer elements

Option 2: Create the customer on the server side

Create Payment Type and Customer Resources

Step 2: Make a payment
server side

Make a charge transaction

Step 3: Check status of the payment
server side

Step 4: Display the payment result
client side

Manage payment
server side

Notifications

Error handling

Test & go live

See also

Accept Unzer Direct Debit with UI components v2

Step 2: Make a paymentserver side

Step 3: Check status of the paymentserver side

Manage paymentserver side

Step 2: Make a payment
server side

Step 3: Check status of the payment
server side

Manage payment
server side