svelte

Payment form + Svelte

This page explains how to create a dynamic payment form from scratch using svelte and the embedded-form-glue library.

Requirements

You need to install node.js LTS version.

Create the project

Start a new svelte project with:

npm create svelte@latest project-name

More information on svelte getting started.

cd project-name
npm install
# Add the dependency to the project
npm install --save @lyracom/embedded-form-glue
# Run the project
npm run dev

Add the payment form

First you have to add 2 theme files:

File	Description
neon-reset.css	default style applied before the Lyra Javascript Library is loaded
neon.js	theme logic, like waiting animation on submit button, ...

Add them in public/index.html in the the HEAD section:

<!-- theme and plugins. should be loaded in the HEAD section -->
<link rel="stylesheet"
href="https://~~CHANGE_ME_ENDPOINT~~/static/js/krypton-client/V4.0/ext/neon-reset.css">
<script
    src="https://~~CHANGE_ME_ENDPOINT~~/static/js/krypton-client/V4.0/ext/neon.js">
</script>

NOTE:

Replace [CHANGE_ME] with your credentials and endpoints.

For more information about theming, take a look to Lyra theming documentation

Update the src/App.svelte template to:

<script lang="ts">
  /* import embedded-form-glue library */
  import KRGlue from '@lyracom/embedded-form-glue'
  import { onMount } from 'svelte'

  let message: string = ''

  onMount(async () => {
    const endpoint = '~~CHANGE_ME_ENDPOINT~~'
    const publicKey = '~~CHANGE_ME_PUBLIC_KEY~~'
    let formToken = 'DEMO-TOKEN-TO-BE-REPLACED'

    try {
      const res = await fetch('http://localhost:3000/createPayment', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          paymentConf: { amount: 10000, currency: 'USD' }
        })
      })
      formToken = await res.text()
      const { KR } = await KRGlue.loadLibrary(
        endpoint,
        publicKey
      ) /* Load the remote library */

      await KR.setFormConfig({
        /* set the minimal configuration */ formToken: formToken,
        'kr-language': 'en-US' /* to update initialization parameter */
      })

      await KR.renderElements('#myPaymentForm') /* create a payment form */
    } catch (error) {
      message = error + ' (see console for more details)'
    }
  })
</script>

<main>
  <div class="container">
    <h1>Svelte Example</h1>
    <div class="form-container" id="myPaymentForm">
      <div class="kr-smart-form" kr-card-form-expanded />
    </div>
    <div class="message" data-test="payment-message">{message}</div>
  </div>
</main>

The first transaction

To make the first transaction, please see the first transaction guide.

Payment hash verification

To learn how to verify the payment hash, please see the payment hash verification information.

Run this example

You can try the current example from the current repository by cloning the repository and executing the following commands:

cd examples/svelte
npm i
npm run dev

To run the example Node.js server, execute the following commands:

cd examples/server
npm i
npm run start

Remember to replace the [CHANGE_ME] values with your credentials and endpoints before executing the project.