The payment gateway provides the option to use an iFrame to seamlessly integrate the payment pages into your website, allowing your customers to make payments without leaving your site.


Using the iFrame mode requires the merchant website to use the HTTPS protocol on all of its pages. This is necessary to ensure secure communication between the merchant's website and the OnePay gateway, providing a safe environment for processing payment transactions.

If you want to customize the checkout experience while maintaining PCI compliance, it is recommended to use the iFrame payment form. This approach allows you to embed the payment form within your website using an iFrame, providing a seamless and secure payment experience for your customers while reducing your PCI compliance scope.

Enable Plug in

  • Login to Virtual Terminal
  • Navigate to Settings and click on "Plug in"

Trusted URL - In production, you should set the allowed URLs for the iFrame to ensure that it can only be activated from the intended websites. You can separate multiple domains using commas. Ex: ,

CSS -The Style Sheet URL field is used to specify the URL of the style sheet to be used for the payment form, if the style is based on the generic OnePay style sheet. If the payment form is enabled with overriding CSS while invoking, the style sheet specified here will be ignored.

Key - The key that will be generated by OnePay to be used as authentication key to authenticate the iFrame is a unique token that is used to verify the authenticity of the payment form and ensure that it is being accessed from a trusted source.

Account type- The account type checkboxes allow the merchant to select which payment options they want to offer to their customers. They can choose to display Credit Card or ACH or both as available payment options on the iFrame.

URL used for

Sandbox: Demo URL
Production: Prod URL

CSS Reference -

Embedding Plugin

The simple integration uses _<script>_ tag that must be added inside your payment _<form>_ tag. That script tag is replace with payment button that will open Plugin when clicked. After successful payment function the results will be added to surrounding <form> as hidden <input> tags

<form action="/your-payment-handler" method="post">
 <script id="scriptIframe" type="text/javascript" src=""

Configuration parameters

These parameters can be added to your <script> tag to configure Pay UI parameters.

Mandatory Field

data-key*The key generated by OnePay to authenticate Pay UI
data-mode*Accepted values: token, payment
token : will set the mode of the Pay UI for tokenization only
payment: will set the mode of the Pay UI for payment
data-displayMode*Accepted values: popup, inline
popup: will create a modal popup of the UI in a parent page
inline: will create a inline content within the parent page
data-cssURL of the stylesheet to be used by Pay UI
data-tokentoken value to be updated by the Pay UI
data-headerHeader text to be displayed
data-amountAmount for payment if data-mode is payment

Optional Field

data-firstnameAdd parameter to enter First name field on the UI
data-lastnameAdd parameter to enter Last name field on the UI
data-cityAdd parameter to enter City field on the UI
data-addressAdd parameter to enter Address field on the UI
data-stateAdd parameter to enter State field on the UI
data-zipcodeAdd parameter to enter Zip Code field on the UI
data-emailAdd parameter to enter Email field on the UI

Javascript Payment Method:

When data-mode is payment in the script tag -

function MakePayment(header, amount, customerId, divIdCheckout) 

You should call this above method in your webpage for Onepay response.

header: display title name for popup

amount: Configurable to set an amount to make a payment. This can be left empty if amount is entered on the webpage.

customerId: If customer id needs to be passed, for payment to the customer, mention id. This field can be left empty.

divIdCheckout: This is the id to be passed as a string, to render checkout in particular div element when data- displayMode="inline". For popup display mode, this value can left empty.

Example HTML:

<!DOCTYPE html>
<!--Sample HTML-->
<html lang="en" xmlns="">
    <meta charset="utf-8" />
 /* Step 3: Invoke functions to call onepay methods*/
        function checkout() {
            let amount = document.getElementById("txtAmt").value;
            MakePayment('test', amount, '', "divIdCheckout")
        function addtoken() {
            AddCard("token", "divIFrameId", '')
        function edittoken() {
            let token = document.getElementById("txttoken").value;
            EditCard("token",token, "divIFrameId", '')

    <!--Step 1: Insert Script tags-->
    <!--Use the URL of the js file provided by OnePay
        Setup data tags as required-->
    <script id="scriptIframe" type="text/javascript" src=""
    <div id="divIdCheckout">
    <div id="divIFrameId">
    <input id="onepayResult" type="hidden" />
    <input id="onepayToken" type="hidden" />
    <!--Step 2: Call input fields and buttons -->
    <p>Enter the amount to pay </p>
    <input type="text" id="txtAmt" value="" placeholder="Amount" maxlength="12" style="width:110px" />
    <button onclick="checkout()"> Payment</button>
    <br /><br />
    <p>Click below to save a new card on file </p>
    <button onclick="addtoken()"> Add card </button>
    <br /><br />
    <p>Enter token to edit an existing card on file  </p>
    <input type="text" id="txttoken" value="" placeholder="token" maxlength="100" style="width:110px" />
    <button onclick="edittoken()"> Edit card </button>