Test a Paddle integration in the sandbox

When to use this skill

Use this skill when verifying a Paddle integration before going live — running real-looking checkouts, triggering webhook events, and exercising subscription state changes without taking real money. Covers sandbox configuration, test card numbers, the webhook simulator (single events and scenarios), local development with public tunnels, and the differences between sandbox and live behavior that bite people in production.

This skill is the safety net for everything else. Apply it alongside checkout-web, webhooks, and subscription-sync whenever you ship — sandbox testing is the cheapest way to catch integration bugs.

Sandbox vs production at a glance

Paddle gives you two completely separate environments: