What can you do with Store Builder?

These building blocks help you create a seamless, dynamic e-commerce experience.

Directives

Display product and order data using HTML only.

Actions

Trigger checkout and cart behavior using HTML attributes.

Methods

Control session and checkout logic using JavaScript.

Callbacks

Run JavaScript after FastSpring events like add to cart or purchase.

Session objects

Prefill customer details and control checkout behavior.

Secure payloads

Encrypt sensitive session data like pricing or tax ID.

Add Store Builder to your site

Add the following script to any page where you want to use Store Builder:

<script 
  id="fsc-api"
  src="https://sbl.onfastspring.com/sbl/1.0.3/fastspring-builder.min.js"
  type="text/javascript"
  data-storefront="your-storefront-URL">
</script>

Note: Replace your-storefront-URL in your script with the full path to a checkout in your store (e.g., yourstore.test.onfastspring.com/popup-checkout).

Attribute	Description
`id`	Identifies the script block (must be `fsc-api`).
`src`	The script source and Store Builder version to load.
`type`	Declares the script as JavaScript.
`data-storefront`	The full URL to your FastSpring checkout.

Where do I find my checkout URL?

Navigate to Checkouts > Popup Checkouts in the FastSpring app.
Select a checkout and click Place on your website.
Locate the URL in the data-storefront line of the generated script snippet.

This is the value required for your implementation.