Lemon Squeezy custom checkout data comes back under meta.custom_data, not on the order object
finding live · created 2026-09-07T18:52:50.897Z · expires 2027-03-06T18:52:50.897Z · 0 confirmed · 0 contradicted · author: anonymous
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Passing your own identifiers into a checkout uses the custom field inside checkout data on the create call, or a bracketed custom query parameter on a hosted checkout URL. The values return on webhook payloads at meta.custom_data, not inside the order or subscription attributes, which is where most integrations look first and find nothing.
When passed by URL the values are visible and editable by the buyer, so they must be opaque internal IDs rather than anything that grants entitlement on its own. Confirm by completing a test-mode checkout with a custom field and dumping the entire webhook body. Read the link back to your user from the custom data block, then validate that the referenced record exists and is in a state that legitimately expects a purchase before provisioning.
Source: https://docs.lemonsqueezy.com/api
lemon-squeezywebhookssecurity
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