Click-To-Pay Initial Setup


Our simple iFields integration enables online Click-To-Pay processing through the Cardknox gateway. This document details the steps necessary to integrate Click-To-Pay with your site.


Register for Click-To-Pay: See [insert link here]

Implementing Click-To-Pay

Client-Side Integration

Adding Reference to iFields

Find the latest version of iFields at:
Step 1: Add the iFields.js file after the <head> tag on your payment page:
<script src=**ifields-version-number**/ifields.min.js></script>

Adding JavaScript Objects for Click-To-Pay button

Step 1: Add the following JS snippet inside the <body> where the Click-To-Pay button is desired.
<div id="click2payContainer">
Step 2: Create JavaScript object that holds all of the properties/methods required to process Click-To-Pay.
const click2payRequest = {
paymentPrefill: function(){
const result = {
merchantRequestId: "Merchant defined request ID",
currencyCode: "USD",
description: "...corp Product",
orderId: "Merchant defined order ID",
promoCode: "Merchant defined promo code",
subtotal: roundTo(getAmount(), 2),
shippingHandling: "2.00",
tax: "2.00",
discount: "1.00",
giftWrap: "2.00",
misc: "1.00",
setTotal: function() { = roundTo(
roundToNumber(this.subtotal, 2)
+ roundToNumber(this.shippingHandling, 2)
+ roundToNumber(, 2)
+ roundToNumber(this.giftWrap, 2)
+ roundToNumber(this.misc, 2)
- roundToNumber(, 2)
, 2);
delete this.setTotal;
return this;
label: "paymentPrefill",
data: result
return result;
paymentCallback: function (payload) {
setPayload: function (value) {
document.getElementById('c2p-payload').value = JSON.stringify(value, null, 2);
showHide("divC2PPayload", value);
For a full sample code please refer to Click-To-Pay Sample Code
Step 3: Implement desired callbacks.
For the list of available callbacks, please refer to Click-To-Pay Request object.
There are two main callbacks that must be implemented (the rest are optional):
  • onPaymentPrefill - calculates total amount and sets transaction information.
  • onPaymentSuccess - a callback that will be called after the consumer pays and Click-To-Pay returns a payload with all of the requested consumer information. This is where you need to make an ajax call to your server with the payload. The sample for making an ajax call is below:
Sample Code for Making Ajax Call:
onPaymentSuccess: function(clickToPayResponse) {
return new Promise(function (resolve, reject) {
var xhr = new XMLHttpRequest();"POST", "https://<your domain>/<path to handle authorization>");
xhr.onload = function () {
if (this.status >= 200 && this.status < 300) {
} else {
status: this.status,
statusText: xhr.statusText
xhr.onerror = function () {
status: this.status,
statusText: xhr.statusText
xhr.setRequestHeader("Content-Type", "application/json");
For full integration code, please refer to Click-To-Pay iFields Integration

Enable Click-To-Pay

window.ckClickToPay object - controls initialization of Click-To-Pay button
Call Required
Initializes and enables Click-To-Pay Button.

enableClickToPay Parameters

Object that contains initialization parameters for Click-To-Pay
For full list of Init Parameters, please refer to Click-To-Pay Request Object
Enable Click-To-Pay example
environment: c2pEnvironment.sandbox,
externalClientId: "<Your externalClientId>",
click2payContainer: "click2payContainer",
onPaymentPrefill: click2payRequest.paymentPrefill,
onPaymentSuccess: click2payRequest.paymentCallback

Server-Side Integration

Server Endpoint Creation

A server endpoint is needed in order to accept the Click-To-Pay Payload from your website.
Step 1: Create an endpoint and method for API Integration on your server side that takes a Click-To-Pay Payload and makes a call to Cardknox.
For full list of Returned Parameters, please refer to Click-To-Pay Response Reference

API Integration

This section assumes that you already know how to integrate other payments with Cardknox API
Below are the steps to integrate Click-To-Pay with the Cardknox API:
Once the consumer confirms the payment, Click-To-Pay API generates a Click-To-Pay Response in the form of a JSON string.
Integration Steps:
  1. 1.
    Set the required fields:
    1. 1.
      xDigitalWalletType to ClickToPay
    2. 2.
      xClickToPayTransactionId to clickToPayResponse.payload.transactionId
    3. 3.
      xClickToPayExternalClientId to clickToPayResponse.payload.externalClientId
    4. 4.
      xClickToPayEncryptionKey to clickToPayResponse.payload.encryptionKey
    5. 5.
      xCardNum to clickToPayResponse.payload.token
    6. 6.
      xAmount to clickToPayResponse.amount
    7. 7.
      xCommand - Set to one of the values that starts with cc: like cc:sale, cc:auth, etc.
    8. 8.
      xKey to "Your xKey"
    9. 9.
      xVersion = "4.5.9"
    10. 10.
      xSoftwareName to “Your Software Name"
    11. 11.
      xSoftwareVersion to "Your Software Version"
Sample Request:
public async Task<IActionResult> Authorize(clickToPayResponse resp)
var reqGateway = new
xKey = "Your xKey",
xDigitalWalletType = "ClickToPay",
xAmount = (decimal)resp.amount,
xClickToPayTransactionId = resp.payload.transactionId,
xClickToPayExternalClientId = resp.payload.externalClientId,
xClickToPayEncryptionKey = resp.payload.encryptionKey,
xCardNum = resp.payload.token,
xCommand = "cc:sale",
xVersion = "4.5.8",
xSoftwareName= "Your Software Name",
xSoftwareVersion = "Your Software Version"
var respMsg = "";
using (var http = new HttpClient())
var resp = await http.PostAsJsonAsync("", reqGateway);
respMsg = await resp.Content.ReadAsStringAsync();
For more details, please contact your Cardknox Representative.