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Create a session to pay with a card

Last Updated: 19 September 2024 | Change Log

Create a session to pay with a card

Use our Web SDK to secure your customer's card details by creating a session.

Full integration example code

<section class="container">
    <section class="card">
        <form class="checkout" id="card-form">
            <div class="label">Card number <span class="type"></span></div>
            <section id="card-pan" class="field"></section>
            <section class="col-2">
                <section class="col">
                    <div class="label">Expiry date</div>
                    <section id="card-expiry" class="field"></section>
                </section>
                <section class="col">
                    <div class="label">CVV</div>
                    <section id="card-cvv" class="field"></section>
                </section>
            </section>
            <button class="submit" type="submit">Pay Now</button>
        </form>
        <button class="clear" id="clear">Clear</button>
    </section>
</section>

<script src="https://try.access.worldpay.com/access-checkout/v2/checkout.js"></script>

// For production change to "https://access.worldpay.com/access-checkout/v2/checkout.js"

Create your checkout form

You must use unique identifiers and field configuration when creating your form. You must then apply default heights to your fields.

Here is an example of how you would set unique identifiers for your field configuration:

HTML

<section class="container">
    <section class="card">
        <form class="checkout" id="card-form">
            <div class="label">Card number <span class="type"></span></div>
            <section id="card-pan" class="field"></section>
            <section class="col-2">
                <section class="col">
                    <div class="label">Expiry date</div>
                    <section id="card-expiry" class="field"></section>
                </section>
                <section class="col">
                    <div class="label">CVV</div>
                    <section id="card-cvv" class="field"></section>
                </section>
            </section>
            <button class="submit" type="submit">Pay Now</button>
        </form>
        <button class="clear" id="clear">Clear</button>
    </section>
</section>

<script src="https://try.access.worldpay.com/access-checkout/v2/checkout.js"></script>

// For production change to "https://access.worldpay.com/access-checkout/v2/checkout.js"

And an example of how you could set the layout of your checkout page:

CSS

body {
  font: 11px/22px sans-serif;
  text-transform: uppercase;
  background-color: #f7f7f7;
  color: black;
}

.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  position: relative;
  background: white;
  padding: 40px 30px;
  top: -30px;
  width: 100%;
  max-width: 300px;
  border-radius: 12px;
  box-shadow: 3px 3px 60px 0px rgba(0, 0, 0, 0.1);
}
.card .checkout .col-2 {
  display: flex;
}
.card .checkout .col-2 .col:first-child {
  margin-right: 15px;
}
.card .checkout .col-2 .col:last-child {
  margin-left: 15px;
}
.card .checkout .label .type {
  color: green;
}
.card .checkout.visa .label .type:before {
  content: "(visa)";
}
.card .checkout.mastercard .label .type:before {
  content: "(master card)";
}
.card .checkout.amex .label .type:before {
  content: "(american express)";
}
.card .checkout .field {
  height: 40px;
  border-bottom: 1px solid lightgray;
}
.card .checkout .field#card-pan {
  margin-bottom: 30px;
}
.card .checkout .field.is-onfocus {
  border-color: black;
}
.card .checkout .field.is-empty {
  border-color: orange;
}
.card .checkout .field.is-invalid {
  border-color: red;
}
.card .checkout .field.is-valid {
  border-color: green;
}
.card .checkout .submit {
  background: red;
  position: absolute;
  cursor: pointer;
  left: 50%;
  bottom: -60px;
  width: 200px;
  margin-left: -100px;
  color: white;
  outline: 0;
  font-size: 14px;
  border: 0;
  border-radius: 30px;
  text-transform: uppercase;
  font-weight: bold;
  padding: 15px 0;
  transition: background 0.3s ease;
}
.card .checkout.is-valid .submit {
  background: green;
}

.clear {
  background: grey;
  position: absolute;
  cursor: pointer;
  left: 50%;
  bottom: -120px;
  width: 200px;
  margin-left: -100px;
  color: white;
  outline: 0;
  font-size: 14px;
  border: 0;
  border-radius: 30px;
  text-transform: uppercase;
  font-weight: bold;
  padding: 15px 0;
  transition: background 0.3s ease;
}

Initializing the SDK

Once you've included the script to get our SDK and set your form and fields configuration, you must initialize the SDK.

Use the Worldpay.checkout.init method to do this.

You must provide your AccessCheckoutIdentity, unique form identifier, and field configuration when initializing the SDK.

Optional configuration

You can also provide your:

Example - Initialize the SDK (mandatory parameters/ configuration)

JavaScript

(function () {
  var form = document.getElementById("card-form");
  var clear = document.getElementById("clear");
  Worldpay.checkout.init(
    {
      id: "your-checkout-id",
      form: "#card-form",
      fields: {
        pan: {
          selector: "#card-pan",
          placeholder: "4444 3333 2222 1111"
        },
        expiry: {
          selector: "#card-expiry",
          placeholder: "MM/YY"
        },
        cvv: {
          selector: "#card-cvv",
          placeholder: "123"
        }
      },
      styles: {
        "input": {
          "color": "black",
          "font-weight": "bold",
          "font-size": "20px",
          "letter-spacing": "3px"
        },
        "input#pan": {
          "font-size": "24px"
        },
        "input.is-valid": {
          "color": "green"
        },
        "input.is-invalid": {
          "color": "red"
        },
        "input.is-onfocus": {
          "color": "black"
        }
      },
      accessibility: {
        ariaLabel: {
          pan: "my custom aria label for pan input",
          expiry: "my custom aria label for expiry input",
          cvv: "my custom aria label for cvv input"
        },
        lang: {
          locale: "en-GB"
        },
        title: {
          enabled: true,
          pan: "my custom title for pan",
          expiry: "my custom title for expiry date",
          cvv: "my custom title for security code"
        }
      },
      acceptedCardBrands: ["amex", "diners", "discover", "jcb", "maestro", "mastercard", "visa"],
      enablePanFormatting: true
    },
    function (error, checkout) {
      if (error) {
        console.error(error);
        return;
      }

      form.addEventListener("submit", function (event) {
        event.preventDefault();

        checkout.generateSessionState(function (error, sessionState) {
          if (error) {
            console.error(error);
            return;
          }

          // session state for card details
          alert(sessionState);
        });
      });

      clear.addEventListener("click", function(event) {
        event.preventDefault();
        checkout.clearForm(function() {
          // trigger desired behaviour on cleared form
          console.log('Form successfully cleared');
        });
      });
    }
  );
})();
ParameterRequiredDescription
id✅Your Access Checkout ID. e.g. f7a25ad0-0224-46c2-9102-2229aaadbfec
form✅Your unique form #id selector.
styles❌Your optional styles object configuration.
fields✅The object that contains your field configurations.
selector✅The #id selector for a given field.
placeholder❌An optional text preview showing your customer the type of information they should enter in the field.
accessibility❌Your optional accessibility object configuration.
cardBrands❌Your optional An array of the card brands that you wish to accept
enablePanFormatting❌An optional parameter that, if called, enables the PAN formatting behavior.

Generate a session

You must invoke the checkout.generateSessionState method to generate a session.

In the JavaScript example above, sessionState is returned and contains an encrypted payload of your customer's card details.

Caution

Do not validate the structure or length of the session resources. We follow HATEOS standard to allow us the flexibility to extend our APIs with non-breaking changes.

Important

The session has a lifespan of one minute and you can use it only once. If you do not create a token within that time, you must create a new session.

Create a session without CVC

You may want to create a card session without asking your customers to enter their CVC.

In this case you must provide pan, expiry and omit cvv in the list of fields used to initialize the SDK.

You still invoke the checkout.generateSessionState method to generate a session.

Here is an example of how to achieve this:

(function () {
  var form = document.getElementById("card-form");
  var clear = document.getElementById("clear");
  Worldpay.checkout.init(
    {
      id: "your-checkout-id",
      form: "#card-form",
      fields: {
        // note that the list of fields does not contain 'cvv'
        pan: {
          selector: "#card-pan",
          placeholder: "4444 3333 2222 1111"
        },
        expiry: {
          selector: "#card-expiry",
          placeholder: "MM/YY"
        }
      },
      styles: {
        "input": {
          "color": "black",
          "font-weight": "bold",
          "font-size": "20px",
          "letter-spacing": "3px"
        },
        "input#pan": {
          "font-size": "24px"
        },
        "input.is-valid": {
          "color": "green"
        },
        "input.is-invalid": {
          "color": "red"
        },
        "input.is-onfocus": {
          "color": "black"
        }
      },
      accessibility: {
        ariaLabel: {
          pan: "my custom aria label for pan input",
          expiry: "my custom aria label for expiry input",
          cvv: "my custom aria label for cvv input"
        },
        lang: {
          locale: "en-GB"
        },
        title: {
          enabled: true,
          pan: "my custom title for pan",
          expiry: "my custom title for expiry date",
          cvv: "my custom title for security code"
        }
      },
      acceptedCardBrands: ["amex", "diners", "discover", "jcb", "maestro", "mastercard", "visa"],
      enablePanFormatting: true
    },
    function (error, checkout) {
      if (error) {
        console.error(error);
        return;
      }

      form.addEventListener("submit", function (event) {
        event.preventDefault();

        checkout.generateSessionState(function (error, sessionState) {
          if (error) {
            console.error(error);
            return;
          }

          // session state for card details
          alert(sessionState);
        });
      });

      clear.addEventListener("click", function(event) {
        event.preventDefault();
        checkout.clearForm(function() {
          // trigger desired behaviour on cleared form
          console.log('Form successfully cleared');
        });
      });
    }
  );
})();

Clear Form

The SDK also exposes a clearForm method that allows the SDK to be reset. All fields and classes are set back to their original state, without reloading the SDK.

The clearForm method accepts a callback that is called when the entire form has successfully cleared.

Customer behavior would usually trigger this. For example:

  • Clicking a clear form button
  • Successful receipt of a session

This allows the customer to input multiple sets of card details without reloading the SDK.

Removing the SDK

You can remove the SDK from a page using the remove method. This method removes all the fields added to the page by the SDK.

Browser support

  • Versions 2.0.0, 1.11.0 and below do not support Safari ≥ 17 when the "Use advanced tracking and fingerprinting protection" setting is enabled. This issue has been fixed in version 2.1.0
  • Minor version 1.7.0 does not support Firefox, Edge Legacy and Chrome ≥ 91
  • Minor version 1.7.1 does not support Edge Legacy and Chrome ≥ 91
  • Minor version 1.7.2 does not support Chrome ≥ 91 (issue has been fixed in 1.7.3)

We support all the latest versions of major browsers on all other versions.


Next steps

Using the Payments API

Using our Modular APIs