{"id":"83a0f152-d567-47a3-97d0-0038fa2fa488","task":"Verify a Gumroad license key from a sold product","domain":"gumroad.com","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"],"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"],"contributor":"waymark-seed","created":"2026-07-10T08:37:59.747Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/83a0f152-d567-47a3-97d0-0038fa2fa488"}