™2 min read
Definition
Live mode and test mode are fully separate environments. Every webhook envelope carries livemode: true for production, false for sandbox. Test and live have separate data, separate webhook endpoints and separate signing secrets. A well-built handler asserts the mode it expects and rejects the other, so a stray test event never touches production logic. Test everything in sandbox first — see Test a webhook locally.
Frequently asked questions
Can a test event reach my live endpoint?
Endpoints are registered per mode, so no — but assert livemode in your handler anyway as a safety net.
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