# Accept a payment with Kriya

Learn how to set up your integration with Kriya.

# Checkout Sessions API


To determine which API meets your business needs, see the [comparison guide](https://docs.stripe.com/payments/checkout-sessions-and-payment-intents-comparison.md).

Use the [Payment Element](https://docs.stripe.com/payments/payment-element.md) 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](https://docs.stripe.com/payments/accept-a-payment.md) integration guide.

## Determine compatibility

**Supported business locations**: UK

**Supported currencies**: `gbp`

**Presentment currencies**: `gbp`

**Payment mode**: Yes

**Setup mode**: No

**Subscription mode**: No

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

- *Prices* (Prices define how much and how often to charge for products. This includes how much the product costs, what currency to use, and the interval if the price is for subscriptions) 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.

#### Ruby

```bash
# Available as a gem
sudo gem install stripe
```

```ruby
# 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](https://docs.stripe.com/api/checkout/sessions/create.md) and returns its [client secret](https://docs.stripe.com/api/checkout/sessions/object.md#checkout_session_object-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](https://docs.stripe.com/payments/payment-methods/dynamic-payment-methods.md) to dynamically display the most relevant eligible payment methods to each customer to maximize conversion. You can also [manually list payment methods](https://docs.stripe.com/payments/payment-methods/integration-options.md#listing-payment-methods-manually), which disables dynamic payment methods.

#### Manage payment methods from the Dashboard

#### TypeScript

```javascript
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: 'elements',
    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');
});
```

#### Manually list payment methods

#### TypeScript

```javascript
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: 'elements',
    payment_method_types: ['kriya'],
    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]

#### HTML + JS

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/dahlia/stripe.js”></script>`. Learn more about [Stripe.js versioning](https://docs.stripe.com/sdks/stripejs-versioning.md).

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

> Stripe provides an npm package that you can use to load Stripe.js as a module. See the [project on GitHub](https://github.com/stripe/stripe-js). Version [7.0.0](https://www.npmjs.com/package/%40stripe/stripe-js/v/7.0.0) or later is required.

Initialize stripe.js.

```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(
  '<<YOUR_PUBLISHABLE_KEY>>',
);
```

#### React

Install [React Stripe.js](https://www.npmjs.com/package/@stripe/react-stripe-js) and the [Stripe.js loader](https://www.npmjs.com/package/@stripe/stripe-js) from the npm public registry. You need at least version 5.0.0 for React Stripe.js and version 8.0.0 for the Stripe.js loader.

```bash
npm install --save @stripe/react-stripe-js@^5.0.0 @stripe/stripe-js@^8.0.0
```

Initialize a `stripe` instance on your front end with your publishable key.

```javascript
import {loadStripe} from '@stripe/stripe-js';
const stripe = loadStripe("<<YOUR_PUBLISHABLE_KEY>>");
```

## Initialize Checkout [Client-side]

#### HTML + JS

Create either a `clientSecret` promise that resolves with the client secret or set it as the secret directly. Call [initCheckoutElementsSdk](https://docs.stripe.com/js/custom_checkout/init), passing in `clientSecret`. `initCheckoutElementsSdk` returns a [Checkout](https://docs.stripe.com/js/custom_checkout) instance.

The [Checkout](https://docs.stripe.com/js/custom_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()](https://docs.stripe.com/js/custom_checkout/session) 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](https://docs.stripe.com/payments/custom/localize-prices/manual-currency-prices.md) requires no UI changes if you display the `total`.

```javascript
const clientSecret = fetch('/create-checkout-session', {method: 'POST'})
  .then((response) => response.json())
  .then((json) => json.checkoutSessionClientSecret);
const checkout = stripe.initCheckoutElementsSdk({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}`);
}
```

```html
<div id="checkout-container"></div>
```

#### React

Create `clientSecret` as a `Promise<string> | string` containing the client secret returned by your server.

Wrap your application with the [CheckoutElementsProvider](https://docs.stripe.com/js/react_stripe_js/checkout/checkout_provider) component, passing in `clientSecret` and the `stripe` instance.

Use the [useCheckoutElements](https://docs.stripe.com/js/react_stripe_js/checkout/use_checkout_elements) hook in your components to get the [Checkout](https://docs.stripe.com/js/custom_checkout) object, which contains data from the Checkout Session and methods to update the Session.

Use the `Checkout` object as the container for your prices. We recommend reading and displaying the `total` and `lineItems` from the `Checkout` object in your UI.

This lets you enable features with minimal code changes. For example, adding [manual currency prices](https://docs.stripe.com/payments/custom/localize-prices/manual-currency-prices.md) requires no UI changes if you display the `total`.

```jsx
import React from 'react';
import {CheckoutElementsProvider} from '@stripe/react-stripe-js/checkout';
import CheckoutForm from './CheckoutForm';

const clientSecret = fetch('/create-checkout-session', {method: 'POST'})
  .then((response) => response.json())
  .then((json) => json.checkoutSessionClientSecret);

const App = () => {
  return (
    <CheckoutElementsProvider
      stripe={stripe}options={{clientSecret}}
    >
      <CheckoutForm />
    </CheckoutElementsProvider>
  );
};

export default App;
```

```jsx
import React from 'react';
import {useCheckoutElements} from '@stripe/react-stripe-js/checkout';

const CheckoutForm = () => {const checkoutState = useCheckoutElements();
  switch (checkoutState.type) {
    case "loading": return <div>Loading ...</div>;
    case "error": return <div>Error: {checkoutState.error.message}</div>;
    case "success":
      return (
        <pre>{JSON.stringify(checkoutState.checkout.lineItems, null, 2)}
          // A formatted total amount
          Total: {checkoutState.checkout.total.total.amount}
        </pre>
      );
  }
};
```

## Collect customer email [Client-side]

#### HTML + JS

> You can skip this step if you set the customer’s email in one of the following ways:
> 
> - Set it directly in [customer_email](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer_email) when creating the Checkout Session.
- Provide a [customer_account](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer_account) or [customer](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer) that has an email when creating the Checkout Session.
- Implement your own email validation and provide the validated email in [updateEmail](https://docs.stripe.com/js/custom_checkout/update_email) or [confirm](https://docs.stripe.com/js/custom_checkout/confirm) when confirming the Checkout Session.

Use the [Contact Details Element](https://docs.stripe.com/js/custom_checkout/create_contact_details_element) to collect your customer’s email address. It handles email collection and validation for you, and helps customers sign in to Link.

```html
<div id="contact-details-element">
  <!--Stripe.js injects the Contact Details Element-->
</div>
```

```javascript
const contactDetailsElement = checkout.createContactDetailsElement();
contactDetailsElement.mount("#contact-details-element");
```

#### React

> You can skip this step if you set the customer’s email in one of the following ways:
> 
> - Set it directly in [customer_email](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer_email) when creating the Checkout Session.
- Provide a [customer_account](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer_account) or [customer](https://docs.stripe.com/api/checkout/sessions/create.md#create_checkout_session-customer) that has an email when creating the Checkout Session.
- Implement your own email validation and pass in the validated email on [confirm](https://docs.stripe.com/js/react_stripe_js/checkout/confirm) for the Checkout Session.

Use the [ContactDetailsElement](https://docs.stripe.com/js/react_stripe_js/checkout/contact_details_element) to collect your customer’s email address. It handles email collection and validation for you, and helps customers sign in to Link.

```jsx
import {ContactDetailsElement} from '@stripe/react-stripe-js/checkout';

// Inside your CheckoutForm component:
<ContactDetailsElement/>
```

## Collect payment details [Client-side]

Collect payment details on the client with the [Payment Element](https://docs.stripe.com/payments/payment-element.md). The Payment Element is a prebuilt UI component that simplifies collecting payment details for a variety of payment methods.

#### HTML + JS

First, create a container DOM element to mount the [Payment Element](https://docs.stripe.com/payments/payment-element.md). Then create an instance of the `Payment Element` using [checkout.createPaymentElement](https://docs.stripe.com/js/custom_checkout/create_payment_element) and mount it by calling [element.mount](https://docs.stripe.com/js/element/mount), providing either a CSS selector or the container DOM element.

```html
<div id="payment-element"></div>
```

```javascript
const paymentElement = checkout.createPaymentElement();
paymentElement.mount('#payment-element');
```

See the [Stripe.js docs](https://docs.stripe.com/js/custom_checkout/create_payment_element#custom_checkout_create_payment_element-options) to view the supported options.

You can [customize the appearance](https://docs.stripe.com/payments/checkout/customization/appearance.md) of all Elements by passing [elementsOptions.appearance](https://docs.stripe.com/js/custom_checkout/init#custom_checkout_init-options-elementsOptions-appearance) when initializing Checkout on the front end.

#### React

Mount the [Payment Element](https://docs.stripe.com/payments/payment-element.md) component within the [CheckoutElementsProvider](https://docs.stripe.com/js/react_stripe_js/checkout/checkout_provider).

```jsx
import React from 'react';
import {PaymentElement, useCheckoutElements} from '@stripe/react-stripe-js/checkout';

const CheckoutForm = () => {
  const checkoutState = useCheckoutElements();
  return (
    <form>
      <PaymentElement options={{layout: 'accordion'}}/>
    </form>
  )
};

export default CheckoutForm;
```

See the [Stripe.js docs](https://docs.stripe.com/js/custom_checkout/create_payment_element#custom_checkout_create_payment_element-options) to view the supported options.

You can [customize the appearance](https://docs.stripe.com/payments/checkout/customization/appearance.md) of all Elements by passing [elementsOptions.appearance](https://docs.stripe.com/js/react_stripe_js/checkout/checkout_provider#react_checkout_provider-options-elementsOptions-appearance) to the [CheckoutElementsProvider](https://docs.stripe.com/js/react_stripe_js/checkout/checkout_provider).

## Submit the payment [Client-side]

#### HTML + JS

Render a **Pay** button that calls [confirm](https://docs.stripe.com/js/custom_checkout/confirm) from the `Checkout` instance to submit the payment.

```html
<button id="pay-button">Pay</button>
<div id="confirm-errors"></div>
```

```js
const checkout = stripe.initCheckoutElementsSdk({clientSecret});

checkout.on('change', (session) => {
  document.getElementById('pay-button').disabled = !session.canConfirm;
});

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;
      }
    });
  });
}
```

#### React

Render a **Pay** button that calls [confirm](https://docs.stripe.com/js/custom_checkout/confirm) from [useCheckoutElements](https://docs.stripe.com/js/react_stripe_js/checkout/use_checkout_elements) to submit the payment.

```jsx
import React from 'react';
import {useCheckoutElements} from '@stripe/react-stripe-js/checkout';

const PayButton = () => {
  const checkoutState = useCheckoutElements();
  const [loading, setLoading] = React.useState(false);
  const [error, setError] = React.useState(null);

  const handleClick = () => {
    setLoading(true);
    checkoutState.checkout.confirm().then((result) => {
      if (result.type === 'error') {
        setError(result.error)
      }
      setLoading(false);
    })
  };

  return (
    <div>
      <button disabled={!checkoutState.checkout.canConfirm || loading} onClick={handleClick}>
        Pay
      </button>
      {error && <div>{error.message}</div>}
    </div>
  )
};

export default PayButton;
```

## Test your integration

To test your integration, choose the payment method and tap **Pay**. In a *sandbox* (A sandbox is an isolated test environment that allows you to test Stripe functionality in your account without affecting your live integration. Use sandboxes to safely experiment with new features and changes), 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.