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Accept a payment with KriyaPrivate Vorschau

Learn how to set up your integration with Kriya.

Use the Payment Element to embed a custom Stripe payment form in your website or application and offer payment methods to customers. For advanced configurations and customizations, refer to the Accept a Payment integration guide.

Determine compatibility

To support Kriya payments, a Checkout Session must satisfy all of the following conditions:

  • Prices for all line items must be in the same currency.
  • If you have line items in different currencies, create separate Checkout Sessions for each currency.

Set up the server
Server-side

Use the official Stripe libraries to access the API from your application.

Command Line
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# Available as a gem
sudo gem install stripe
Gemfile
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# If you use bundler, you can add this line to your Gemfile
gem 'stripe'

Create a Checkout Session
Server-side

Add an endpoint on your server that creates a Checkout Session and returns its client secret to your front end. A Checkout Session represents your customer’s session as they pay for one-time purchases or subscriptions. Checkout Sessions expire 24 hours after creation.

We recommend using dynamic payment methods to dynamically display the most relevant eligible payment methods to each customer to maximize conversion. You can also manually list payment methods, which disables dynamic payment methods.

server.ts
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import express, {Express} from 'express';

const app: Express = express();

app.post('/create-checkout-session', async (req: Express.Request, res: Express.Response) => {
  const session = await stripe.checkout.sessions.create({
    line_items: [
      {
        price_data: {
          currency: 'gbp',
          product_data: {
            name: 'T-shirt',
          },
          unit_amount: 1000,
        },
        quantity: 1,
      },
    ],
    mode: 'payment',
    ui_mode: 'custom',
    return_url: 'https://example.com/return?session_id={CHECKOUT_SESSION_ID}'
  });

  res.json({checkoutSessionClientSecret: session.client_secret});
});

app.listen(3000, () => {
  console.log('Running on port 3000');
});

Set up the front end
Client-side

Include the Stripe.js script on your checkout page by adding it to the head of your HTML file. Always load Stripe.js directly from js.stripe.com to remain PCI compliant. Don’t include the script in a bundle or host a copy of it yourself.

Make sure you’re on the latest Stripe.js version by including the following script tag <script src=“https://js.stripe.com/clover/stripe.js”></script>. Learn more about Stripe.js versioning.

checkout.html
<head>
  <title>Checkout</title>
  <script src="https://js.stripe.com/clover/stripe.js"></script>
</head>

Hinweis

Stripe provides an npm package that you can use to load Stripe.js as a module. See the project on GitHub. Version 7.0.0 or later is required.

Initialize stripe.js.

checkout.js
// Set your publishable key: remember to change this to your live publishable key in production
// See your keys here: https://dashboard.stripe.com/apikeys
const stripe = Stripe(
  
'pk_test_TYooMQauvdEDq54NiTphI7jx'
,
);

Initialize Checkout
Client-side

Create either a clientSecret promise that resolves with the client secret or set it as the secret directly. Call initCheckout, passing in clientSecret. initCheckout returns a promise that resolves to a Checkout instance.

The checkout object acts as the foundation of your checkout page, and contains data from the Checkout Session and methods to update the Session.

The object returned by actions.getSession() contains your pricing information. We recommend reading and displaying the total, and lineItems from the session in your UI.

This lets you turn on new features with minimal code changes. For example, adding manual currency prices requires no UI changes if you display the total.

checkout.js
const clientSecret = fetch('/create-checkout-session', {method: 'POST'})
  .then((response) => response.json())
  .then((json) => json.checkoutSessionClientSecret);
const checkout = stripe.initCheckout({clientSecret});
const loadActionsResult = await checkout.loadActions();
if (loadActionsResult.type === 'success') {
  const session = loadActionsResult.actions.getSession();
  const checkoutContainer = document.getElementById('checkout-container');
  checkoutContainer.append(JSON.stringify(session.lineItems, null, 2));
  checkoutContainer.append(document.createElement('br'));
  checkoutContainer.append(`Total: ${session.total.total.amount}`);
}
index.html
<div id="checkout-container"></div>

Collect customer email
Client-side

Create an email input to collect your customer’s email address. Call updateEmail when your customer finishes the input to validate and save the email address.

Depending on the design of your checkout form, you can call updateEmail in the following ways:

  • Directly before submitting the payment. You can also call updateEmail to validate earlier, such as on input blur.
  • Before transitioning to the next step, such as clicking a Save button, if your form includes multiple steps.
index.html
<input type="text" id="email" />
<div id="email-errors"></div>
checkout.js
const checkout = stripe.initCheckout({clientSecret});
const loadActionsResult = await checkout.loadActions();

if (loadActionsResult.type === 'success') {
  const {actions} = loadActionsResult;
  const emailInput = document.getElementById('email');
  const emailErrors = document.getElementById('email-errors');

  emailInput.addEventListener('input', () => {
    // Clear any validation errors
    emailErrors.textContent = '';
  });

  emailInput.addEventListener('blur', () => {
    const newEmail = emailInput.value;
    actions.updateEmail(newEmail).then((result) => {
      if (result.error) {
        emailErrors.textContent = result.error.message;
      }
    });
  });
}

Collect payment details
Client-side

Collect payment details on the client with the Payment Element. The Payment Element is a prebuilt UI component that simplifies collecting payment details for a variety of payment methods.

First, create a container DOM element to mount the Payment Element. Then create an instance of the Payment Element using checkout.createPaymentElement and mount it by calling element.mount, providing either a CSS selector or the container DOM element.

index.html
<div id="payment-element"></div>
checkout.js
const paymentElement = checkout.createPaymentElement();
paymentElement.mount('#payment-element');

See the Stripe.js docs to view the supported options.

You can customize the appearance of all Elements by passing elementsOptions.appearance when initializing Checkout on the front end.

Submit the payment
Client-side

Render a Pay button that calls confirm from the Checkout instance to submit the payment.

index.html
<button id="pay-button">Pay</button>
<div id="confirm-errors"></div>
checkout.js
const checkout = stripe.initCheckout({clientSecret});
const loadActionsResult = await checkout.loadActions();

if (loadActionsResult.type === 'success') {
  const {actions} = loadActionsResult;
  const button = document.getElementById('pay-button');
  const errors = document.getElementById('confirm-errors');
  button.addEventListener('click', () => {
    // Clear any validation errors
    errors.textContent = '';

    actions.confirm().then((result) => {
      if (result.type === 'error') {
        errors.textContent = result.error.message;
      }
    });
  });
}

Test your integration

To test your integration, choose the payment method and tap Pay. In a sandbox, this redirects you to a test payment page where you can approve or decline the payment.

In live mode, tapping Pay redirects you to the Kriya website—you don’t have the option to approve or decline the payment with Kriya.