Click to Pay with Secure Fields

Click to Pay is the better way to pay online – featuring advanced payment technology built on secure remote commerce industry standards.

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Merchant setup

In order to process Click to Pay payments you will need to register as a Digital Payments Application (DPA). You can set up Click to Pay in the dashboard which will automatically register and configure your DPA with Mastercard.

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Prepare the server

Before you can load Click to Pay with Secure Fields into your checkout, you will need to generate a checkout session via the API. This is made easy with our server-side SDKs.

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Install a server-side SDK

Use the package manager in your preferred programming language to install our server-side SDK. Generating a checkout session can only be done server side and we do not recommend doing this client side as it will expose your API key to your customers.

npm install @gr4vy/node --save
# or: yarn add @gr4vy/node

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Initialize the SDK client

Next, initialize the SDK with the ID of your instance and the private key.

const fs = require("fs");
const { Client } = require("@gr4vy/node");
// or: import { Client } from "@gr4vy/node";

const key = String(fs.readFileSync("./private_key.pem"));

const client = new Client({
  gr4vyId: "[GR4VY_ID]",
  privateKey: key,
});

This assumes the key you created in the previous step is kept in a file called private_key.pem that is kept in the same folder next to the code. You could store this key in an environment variable or a secure vault.

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Create a checkout session

With the SDK installed, you can use it to create a checkout session for use with Click to Pay.

const response = await this.newCheckoutSession();

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Create your checkout

With your checkout session ready, it’s time to start creating a card form that can support Click to Pay.

Our frontend integration is called Secure Fields and it essentially wraps each of your credit card input fields in a secure element, keeping you PCI-compliant and allowing for seamless integration with Click to Pay.

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Install Secure Fields

There are two ways to install Secure Fields for use with Click to Pay: either as a Node library or straight off our CDN. Currently, Click to Pay is not yet supported with our React SDK.

npm install @gr4vy/secure-fields --save
# or: yarn add @gr4vy/secure-fields

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Initializing secure fields

With Secure Fields installed it’s now possible to initialize the connection to your instance. It expects a checkout session ID you created earlier.

import SecureFields from "@gr4vy/secure-fields";

// set up the environment
const gr4vyId = "[GR4VY_ID]";
const environment = "sandbox"; // or "production"
const sessionId = "[CHECKOUT_SESSION.ID]";
// initialize the SDK
const secureFields = new SecureFields({
  gr4vyId,
  environment,
  sessionId,
});
// enable debugging
secureFields.setDebug(true);

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Create a card form

Next, you can add any of the 3 individual card fields to your form. You can mix and match these with your own forms, and you can add your own labels.

Let’s start by adding your form with 4 fields: the cardholder’s name, the card number, card expiration date, and the security code for the card.

<form id="cc-form">
  <!-- You can add your own fields as well as secure fields -->
  <label for="cc-holder-name">Name</label>
  <input id="cc-holder-name" placeholder="Name on the card" />

  <!-- These are fields that will become secure fields -->
  <label for="cc-number">Card Number</label>
  <input id="cc-number" />

  <label for="cc-expiry-date">Expiry date</label>
  <input id="cc-expiry-date" />

  <label for="cc-security-code">Security Code</label>
  <input id="cc-security-code" />

  <input type="submit">Pay</button>
</form>

It is important to add all the card inputs including the number, expiration date, and security code. Without each of these fields, a transaction can not be processed. Additional inputs can be added to your form but they will not be handled by our library.

Next, initialize each of the inputs as a secure field.

// Add fields using a querySelector compatible string
const number = secureFields.addCardNumberField("#cc-number", {
  placeholder: "Enter card number",
});

const securityCode = secureFields.addSecurityCodeField("#cc-security-code", {
  placeholder: "Enter CVV",
});

// Alternatively an HTML element can be passed directly
const expiryDate = secureFields.addExpiryDateField(
  document.querySelector("#cc-expiry-date"),
  {
    placeholder: "Enter expiry date",
  }
);

This example replaces each of the <input> fields for the card form with a new PCI secure field. It’s worth noting that we did not attach a secure field for the cardholder name, instead, this field will remain a regular HTML input

You should now see each secure field loaded on your page. Please see our more extensive guides on how to add event listeners and your own styles to Secure Fields.

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Add Click to Pay

Next, add a placeholder component to your form so we know where to render the Click to Pay component. Additionally, add a checkbox to allow a customer not already enrolled to determine if they want to share the card data with Click to Pay or not.

<div id='click-to-pay'></div>

<input type="checkbox" id="cc-opt-in" />
<label for="cc-opt-in">Store my card with Click to Pay</label>

Next, attach the secure field for Click to Pay to this element. This will require the email and/or phone number of the user you want to create a transaction for. It also requires an HTML query for the consent checkbox that controls if the card data for a new card is shared with Click to Pay or not.

secureFields.addClickToPay('#click-to-pay', {
  dpaLocale: 'en_AU',
  cardBrands: ['mastercard', 'visa', 'american-express'],
  email: 'john@example.com',
  mobileNumber: {
    countryCode: "61",
    phoneNumber: "491570159"
  },
  consentCheckbox: "#cc-opt-in"
})

When the user decides to use Click to Pay, or when the user logs out of Click to Pay in order to pay with a new card, the METHOD_CHANGE event will be raised. You can use this event to automatically show or hide parts of the UI based on what payment method a user is paying with.

secureFields.addEventListener(SecureFields.Events.METHOD_CHANGE, ({ method }) => {
  if (method === "card") {
    // show the card fields, hide the Click to Pay component
  } else if (method === "click-to-pay") {
    // hide the card fields, show the Click to Pay component
  }
})

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Handle form submission

To handle a form submissions, you can listen to the submission of the <form> element or a click of the submit button. You can then prevent the default behavior and submit Secure Fields. This will instruct the fields to post the card data (regular, or Click to Pay) to the API.

document.querySelector('#cc-form').addEventListener(
  "submit",
  (e) => {
    e.preventDefault()
    secureFields.submit()
  }
)

Once the data has been submitted, you can use the secureFields object to listen to the card data being successfully, or unsuccessfully vaulted.

secureFields.addEventListener(
  SecureFields.Events.CARD_VAULT_SUCCESS,
  () => {
    // Make an API call to your server to complete the transaction
  }
)

secureFields.addEventListener(
  SecureFields.Events.CARD_VAULT_FAILURE,
  () => {
    // Handle the inability to store the card data
  }
)

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Create a payment

With the card data stored in the vault, you are now ready to create a transaction on the server-side. To create a transaction you can pass the amount, currency, as well as the payment method, in this case a checkout session.

const request = new TransactionRequest();
request.amount = 1299;
request.currency = "AUD";

request.paymentMethod = new TransactionPaymentMethodRequest();
request.paymentMethod.method = "checkout-session";
request.paymentMethod.id = "[CHECKOUT_SESSION.ID]";

const transaction = await client.authorizeNewTransaction(request);

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Error handling

A few more errors can be caught that are related to Click to Pay.

secureFields.addEventListener(
  SecureFields.Events.CLICK_TO_PAY_ERROR,
  ({ error }) => console.log(error)
)

The available error codes for Click to Pay are as follows.

• RETRIES_EXCEEDED - The user has exceeded the maximum number of retries filling in their one-time password (OTP) and their profile is locked. An error message is also displayed on the OTP component. It is recommended to hide the Click to Pay component for the user at this point.
• CODE_INVALID - The user entered an incorrect OTP. An error message is also displayed on the OTP component.
• INVALID_CARD - The user entered incorrect card details, or the details of a card that is not one of the supported schemes.
• SIGN_OUT_FAILED - When attempting to sign out via the “Not you?” link it is possible that Click to Pay is not able to sign out the user. It is recommended to hide the Click to Pay component for the user at this point.
• UNKNOWN - An unknown error occurred. These are usually unrecoverable. For example, the Click to Pay library was not initialized due to an invalid parameter.

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Events

The following events can be listened to by attaching an event handler to the SecureFields instance using the addEventListener method.

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