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Overview

Paddle integration is another option offered by Nadles for payment collection. Paddle is a payment solution provider serving as Merchant of Record. Using a merchant of record allows you to collect payments internationally without the need to care about different taxation rules between countries. Nadles adds missing usage-based billing functionality to Paddle: it records usage data for each subscription and creates corresponding charges in Paddle, so that customers are correctly billed for the actual usage at the end of each billing period.
In contrast to API marketplaces, Nadles doesn’t act as a middleman in the payment process.All payments are made directly to your Paddle account.

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Video guide

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Prerequisites

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Setting up Paddle account

For Nadles to successfully manage your Paddle products and subscriptions, the following data is required:
  • Your Paddle seller ID
  • API key
  • Webhook secret key
Nadles stores this information in encrypted form, you won’t be able to see it again once it’s saved. Follow the steps below to obtain the necessary credentials.

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API key and seller ID

  • On Nadles, navigate to My User Portal → Payment integration.
  • Open Paddle in a new tab and navigate to Developer tools → Authentication.
  • Copy your seller ID into the Your Paddle vendor ID field on Nadles.
  • Click Generate API Key.
  • Enter Nadles as key name.
  • Copy the generated key into the API key field on Nadles.

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Webhook

  • On Paddle, navigate to Developer tools → Notifications.
  • Click New destination.
  • Enter Nadles as description.
  • Select Notification type Webhook.
  • Copy the endpoint URL from the field Your Paddle webhook URL on Nadles into the URL field on Paddle.
  • Check the Select all events checkbox.
  • Click Save destination.
  • After that, click Edit destination and copy the webhook signing secret into the Webhook secret key field on Nadles.
  • Save the Paddle integration form on Nadles.

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Setting up payment page

Paddle requires you to set up a checkout page on your own domain where customers will enter payment details and finish the payment.

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In Nadles User Portal

If you enabled Nadles User Portal for your account and attached a custom domain to it, you can use a pre-built payment page provided by Nadles.
  • Make sure the custom domain that you attached to the user portal is approved in your Paddle account.
  • On Paddle, navigate to Developer tools → Authentication.
  • Click Generate client-side token.
  • Enter Nadles as name.
  • Click Generate and copy the generated token.
  • Navigate to Checkout → Checkout settings.
  • In the field Default payment link enter https://<user-portal-domain>/consumer/checkout/paddle/<generated-client-side-token>
  • Done. Now Paddle will redirect your customers to the payment page provided by Nadles.
  • Don’t forget to customize the style of your Paddle checkout form to match the user portal. For that, navigate to Checkout → Checkout settings → Inline.

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On your website

If you aren’t using Nadles User Portal or didn’t attach a custom domain to it, you can create a payment page on your website. Nadles will redirect your customers to this page for payment. In order to accept payments via Paddle, you need to build an overlay checkout page that accepts Paddle transaction ID and host it on your domain. The overlay checkout page can be as simple as a single HTML page with a bit of JS code. Let’s say you own the domain name myfirstapi.example and plan to host the Paddle checkout page on https://myfirstapi.example/paddle-checkout Follow the steps below to get your Paddle checkout up and running.

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Domain verification

First, get myfirstapi.example approved by Paddle. What is domain verification? Second, set up your default payment link on Paddle to: https://myfirstapi.example/paddle-checkout Nadles will redirect your customers to this page to make a payment. Two query string parameters will be added to the URL:
  1. _ptxn — a checkout transaction ID, added by Paddle. Learn more.
  2. _px_success_url — success URL, added by Nadles. Paddle will redirect the customer to this URL after the payment succeeds.

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Paddle checkout page

Third, build the checkout page and host it on your website. Feel free to use the following template and customize as needed: 
<!DOCTYPE html>
<html>
<body>

<script src="https://code.jquery.com/jquery-3.7.1.min.js" integrity="sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo=" crossorigin="anonymous"></script>
<script src="https://cdn.paddle.com/paddle/v2/paddle.js"></script>

<script type="text/javascript">
  Paddle.Environment.set("sandbox"); // replace with "production" before going live
  Paddle.Setup({ 
    token: '7d279f61a3499fed520f7cd8c08' // replace with your client-side token
  });

  $(function() {
    var urlParams = new URLSearchParams(window.location.search);

    Paddle.Checkout.open({
          transactionId: urlParams.get('_ptxn'),
          settings: {
            theme: "light",
            locale: "en",
            successUrl: urlParams.get('_px_success_url')
        }
    });
  });
</script>

</body>
</html>
Now deploy the page on https://myfirstapi.example/paddle-checkout and you’re good to go. That’s it. Paddle integration is set up and ready.