> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stigg.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Additional resources

<Card title="We've tested the top 40 SaaS companies: This is how they handle upgrades & downgrades [Part 1]" icon="book" href="https://www.stigg.io/blog-posts/weve-tested-the-top-40-saas-companies-this-is-how-they-handle-upgrades-downgrades-part-1" />

<Card title="The only guide you'll ever need to implement upgrade & downgrade flows [Part 2]" icon="book" href="https://www.stigg.io/blog-posts/the-only-guide-youll-ever-need-to-implement-upgrade-downgrade-flows-part-2" />


## Related topics

- [Checkout](/documentation/snap-in-widgets/checkout.md)
- [Credits auto-recharge configuration](/documentation/snap-in-widgets/credit-auto-recharge-configuration.md)
- [Credits auto-recharge status](/documentation/snap-in-widgets/credit-auto-recharge-status.md)
- [Add a time-based trial experience to my product](/guides/i-want-to/add-free-trials.md)
- [Implement a freemium model to increase conversion](/guides/i-want-to/add-freemium.md)