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Developer Shares Google Apps Script to Turn Gumroad Sales into AI-Powered Leads

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A developer has published a roughly 70-line Google Apps Script that automatically converts every Gumroad product sale into a tracked, verified lead inside a Google Sheet. The system uses Gumroad's webhook ping to capture buyer details — including email, product name, and license key — without requiring a CRM or third-party tools like Zapier. Each incoming sale is deduplicated by sale ID and verified against Gumroad's license API to confirm the purchase is genuine before any follow-up is triggered. A time-based trigger then sends an AI-personalized upsell email to each new lead and marks the record to prevent duplicate outreach. The approach is framed as a higher-intent alternative to free lead magnets, since buyers have already demonstrated purchase intent with a small paid 'micro-commitment.'

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