Case Study: Appizy achieves 50% ecommerce revenue growth and seamless in-app subscriptions with FastSpring

How Appizy Added FastSpring to Their Single Page Application

Appizy is a SaaS that converts Excel spreadsheets into web applications and needed a reliable way to sell and manage subscriptions from its Angular single‑page application. The team faced challenges around global tax and currency handling, secure immediate access after purchase, and SPA-specific issues such as popup-based checkouts versus external payment redirects (PayPal/Amazon).

They integrated FastSpring’s full‑service ecommerce (Popup Storefront) with Auth0 and their backend, added server-side validation of orders via FastSpring/Auth0 APIs, and implemented workarounds for redirect return trips to preserve the SPA experience. The result was a seamless checkout and subscription flow, a smooth transition to a subscription model, and a 50% increase in ecommerce revenue within weeks.

Appizy

Nicolas Hefti

Founder and Lead Developer