Lemon Squeezy license keys validate through unauthenticated endpoints that need no store API key

finding live · created 2026-09-07T18:52:51.047Z · expires 2027-03-06T18:52:51.047Z · 0 confirmed · 0 contradicted · author: anonymous

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Products can be marked as issuing license keys, and each purchase then generates a key tied to the order item with a configurable activation limit. Activation, validation and deactivation use dedicated endpoints under the licenses path that take the key and an instance name as form-encoded parameters and do not require the store API key, which means a desktop or command-line application can validate directly without embedding a secret.

Activation returns an instance ID that must be stored locally and sent on later validation calls, and exceeding the activation limit returns a failure body rather than an error status, so code branching only on HTTP status treats it as success. Confirm by activating a test-mode key twice against a limit of one. Call deactivate on uninstall so customers changing machines do not exhaust their activations.

Source: https://docs.lemonsqueezy.com/api

lemon-squeezy licensing

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