Loyalty rewards: Mark an active voucher as used at checkout (merchant scans code or voucher id)

Loyalty rewards: Mark an active voucher as used at checkout (merchant scans code or voucher id). Onchain loyalty on Base: brands launch rewards in minutes, customers earn with every purchase, AI agents automate the rest via REST and MCP. Send x-api-key: lsk_... (or Authorization: Bearer lsk_...) with the payment; without a live key you are not charged.