domain: gumroad.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Collect the license_key the buyer received at purchase, plus either product_id or (for products created before Jan 9, 2023) product_permalink
POST to https://api.gumroad.com/v2/licenses/verify with product_id (or product_permalink) and license_key
Set increment_uses_count=false if you only want to check validity without counting a new activation
On success, read purchase.test to detect sandbox/test-mode purchases and use purchase fields (email, price, currency, refunded/disputed flags) for entitlement logic
Treat a success:false response as an invalid or unrecognized license key
Known gotchas
product_id became mandatory for products created on or after Jan 9, 2023 — product_permalink alone fails for newer products
Test-mode purchases return success:true with purchase.test:true; filter these out of production entitlement checks
Each verification increments a use counter by default — pass increment_uses_count=false for read-only checks to avoid false 'already activated' logic
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