A minimal receive-only GoblinPay payment provider for Medusa v2 under connectors/medusa (service + module registration + types, README + INSTALL), modeled on connectors/woocommerce and the medusa-plugin-btcpay reference: create-invoice on initiate, an HMAC-verified webhook flips the payment to captured, status polling as the webhook-miss fallback. Refunds throw (receive-only, manual). Also refresh the store.rs docstring now that WooCommerce and Medusa have shipped.
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