Blog
Articles on payment webhooks: how Stripe, Paddle, Lemon Squeezy, Polar and Dodo Payments sign events, what their error messages mean, and how to fix them.
- Polar webhook signature: the September 2026 key change and legacy secrets
Why @polar-sh/sdk can answer "No matching signature found" for a Polar webhook secret issued after 8 September 2026, which key your secret uses, and how to verify both.