Seamless Checkout

The Connect2Pay Seamless Checkout is a JavaScript library to be included in the merchants checkout page’s HTML. It renders a responsive payment form for seamlessly passing customer’s payment information into Connect2Pay server and process the payment. The objective of this library is to allow merchants to capture user credit card information in the client-side and pass it directly to Connect2Pay API without breaking PCI-DSS standards.

1 - Create token

To be able to use the Seamless Checkout you need to make a Prepare API call and retrieve the customerToken from the API response:

We strongly advise the use of parameter ctrlCallbackURL.

  • Response:
        "code": "200",
        "message": "Request processed successfully",
        "customerToken": "1234",
        "merchantToken": "4321"

2 - Prepare your HTML

your checkout page you should include a div element with a specified attribute id.

    <div id="payment-container">


Outside the div container, include a script tag with source to our Seamless Checkout library, using the customerToken you have received from step 1. You should add the attributes crossorigin=”anonymous”, “integrity=sha384…”, async=true and data-mount-in={DIV CONTAINER ID}

    <div id="payment-container">
    <script async="true" src="{customerToken}/connect2pay-seamless-v1.4.8.js" data-mount-in="#payment-container"integrity="sha384-M9Dgri87tBDqvrhRCh0JnpnvLvsnGLsc0UKffq72bWXUJLJYsy2qLpbPMA2WW1AO" crossorigin="anonymous"></script>

Voilà! The credit card form is instantly loaded and rendered into your checkout page.

3 - Process callback

Once payment is successful, your server will receive a server-side notification with a JSON object and all the information regarding the payment. This is why it is very important to use the ctrlCallbackURL parameter in the token creation step!


The library can be customized in different ways, depending on the merchants’ needs.

    <div id="payment-form-container">
        <script type="application/json">
                "payButtonText": "Pay €10.99 now!",
                "language": "en,
                "fontFamily": "Helvetica"

Class injection

You can inject external classes directly into the form elements. This is useful is your website is using tools such as Bootstrap.

    <div id="payment-form-container">
        <script type="application/json">
            "payButtonText": "Pay €10.99 now!",
            "customClasses": {
                "cardHolderNameContainer": "form-group",
                "cardHolderName": "form-control",
                "cardNumberContainer": "form-group",
                "cardNumber": "form-control",
                "cardExpireDateShortContainer": "form-group",
                "cardExpireDateShort": "form-control",
                "cardSecurityCodeContainer": "form-group",
                "cardSecurityCode": "form-control"
        <!-- The configuration above will result: -->
        <form class="cardForm__3-0Ac" novalidate="true" id="c2pCreditCardForm">
            <div class="form-group" id="c2pCardHolderNameContainer">
            <label id="c2pCardHolderNameLabel">
                Cardholder Name
            <input type="text" class="formInput__3Sjbj form-control" id="c2pCardHolderName">
            <div class=" form-group" id="c2pCardNumberContainer">
            <label id="c2pCardNumberLabel">
                Card Number
            <input placeholder="____ ____ ____ ____" 
            pattern="[1-9]/d+" class="formInput__3Sjbj cardNumber__5kHQE form-control" id="c2pCardNumber" 

The skipDefaultStyle parameter will remove any default classes from the elements, so you can freely adapt the form with your own CSS classes.

Using id of top container

You can also customize the form defining the specific CSS for the tags of the container form:

    <div id="payment-form-container">

    <style type="text/css">
            #payment-form-container > input[type=text] {
            background-color: #FFF;

Using ID selector of each element

Every element of the form has its own id, so you can select it and customize and modify as you want:

    <style type="text/css">
         #c2pCardHolderName {
             background-color: blue;

Here’s a list of the elements you can fetch

Element ID

Client-side callback

Seamless Checkout can trigger a specified callback function and inject the paymentStatus object as parameter. NEVER use this method for payment confirmation of the order, since the object can be hijacked and values can be modified on the client-side. ALWAYS rely on server-side callback for this purpose.

The client side Javascript callback should be used to request the real payment status towards the merchant server. To avoid synchronization problem between the client request and the server side callback, the merchant server can use the paymentStatus to actively check the result of the payment.

    <!-- Checkout button: -->
    <div class="myCheckoutButtonContainer">
        <button id="myCheckoutButton">Let's Pay!</button>
    <!-- Inside the JSON configuration of the Seamless -->
    <script type="application/json"> 

Accepted configuration parameters

Parameter Accepted Values Description
hideCardHolderName String Hides cardholder name field
onPaymentResult String Callback function to be triggered (don’t use parentheses or semicolons)
noModal Boolean If set, breaks out of modal when 3DSecure authentication step is reached.
fontFamily String Custom font if you like to customize the form
language en, fr, es Language of the labels and placeholders
labels   Object to change the labels of the form
labels.cardHolderName String Label for the CardHolderName input
labels.cardNumber String Label for the CardNumber input
labels.cardExpireDateShort String Label for the Expiration Date input
labels.cardSecurityCode String Label for the CSC input
payButtonText String Text for the payment button e.g. “Pay Now €10.99”
placeholders   Object to change the placeholders of the form’s inputs
placeholders.cardHolderName String Placeholder for the CardHolderName input
placeholders.cardNumber String Placeholder for the CardNumber input
placeholders.cardExpireDateShort String Placeholder for the Expiration Date input
placeholders.cardSecurityCode String Placeholder for the CSC input
customClasses   Object for customization of the elements
customClasses.cardHolderNameContainer String Classes will be applied into cardHolderName div container
customClasses.cardHolderNameLabel String Classes will be applied into cardHolderName label
customClasses.cardHolderName String Classes will be applied into cardHolderName input
customClasses.cardNumberContainer String Classes will be applied into cardNumber div container
customClasses.cardNumberLabel String Classes will be applied into cardNumber label
customClasses.cardNumber String Classes will be applied into cardNumber input
customClasses.cardExpireDateShortContainer String Classes will be applied into cardExpireDate div container
customClasses.cardExpireDateShortLabel String Classes will be applied into cardExpireDate label
customClasses.cardExpireDateShort String Classes will be applied into cardExpireDate input
customClasses.cardSecurityCodeContainer String Classes will be applied into cardSecurityCode div container
customClasses.cardSecurityCodeLabel String Classes will be applied into cardSecurityCode label
customClasses.cardSecurityCode String Classes will be applied into cardSecurityCode input

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