Popup checkout overview

Popup checkouts open in a modal window directly over your site, giving buyers a seamless, same-page checkout flow. FastSpring securely hosts the checkout, processes payments, and delivers fulfillment while maintaining a consistent look and feel with your brand.

Security note: Always use HTTPS for pages that host a popup checkout. This prevents browser security warnings and protects buyer data.

Get started with popup checkouts

Use the guides below to create, configure, and customize your popup checkout.

Create a popup checkout

Create a new popup checkout in the FastSpring app and select a light or dark theme.

Configure checkout experience

Control cart behavior, promotions, customer information, and completion page settings.

Style your checkout

Customize titles, logos, colors, spacing, and completion pages to match your brand.

Checkout analytics and branding

Connect Google Analytics and Tag Manager and customize PayPal branding.

Add a shopping cart

Enable the popup cart, launch it programmatically, and persist customer sessions.

Add checkout to your site

Whitelist your domains, add products, and place the checkout on your site.

Redirect after checkout

Redirect customers to a custom page after they complete a purchase.