# Polar Testing

> Sandbox, test cards, webhooks, CI for Polar

**Subcategory:** Polar  
**License:** Apache-2.0  
**Source:** https://github.com/polarsource/skills/blob/main/skills/polar-testing/SKILL.md

---

## When it is useful

Test Polar integrations in sandbox: checkout, Stripe test cards, webhooks, CI.

## The Catch

Loud: Starter Free forever $0/mo platform fee; MoR take-rate 5% + 50c/txn (+1.5% intl) still applies — not payments free. Pro $20 / Growth $100 / Scale $400 lower take-rate. OSS Apache self-host path. Skills LICENSE 404 — product polarsource/polar Apache-2.0. Polar gem already live. Distinct from Stripe Billing DIY tax and closed MoRs.