Comprehensive Gumroad merchant management for Products, Sales, Licenses, Discounts, Payouts, and Webhooks. Use when Claude needs to: (1) Manage digital or physical inventory, (2) Oversee transactions and process refunds/shipping, (3) Verify or rotate license keys, (4) Manage offer codes, or (5) Monitor payout history and store webhooks.

全面管理Gumroad商家的商品、销售、许可证、折扣、结算和Webhook。适用于Claude需要：（1）管理数字或实物库存，（2）监督交易并处理退款或发货，（3）验证或轮换许可证密钥，（4）管理优惠码，或（5）监控结算记录和存储Webhook的场景。