Loyalty rewards: Preview a gift certificate by LOYAL-XXXXXX code without claiming (face value, expiry, program)

Loyalty rewards: Preview a gift certificate by LOYAL-XXXXXX code without claiming (face value, expiry, program). Onchain loyalty on Base: brands launch rewards in minutes, customers earn with every purchase, AI agents automate the rest via REST and MCP. Pay-only works: the paying wallet is the caller; API key optional.