Developer builds open sandbox to test AI shopping agents' checkout flows

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A developer has built and released acp-sandbox, a hosted mock merchant tool designed to help engineers test AI shopping agents against the emerging ACP checkout protocol without risking real transactions. The tool addresses a gap in the current testing ecosystem, where Stripe's test mode covers payments but no hosted fake merchant existed to verify the protocol layer of agentic commerce. The sandbox implements the ACP checkout session lifecycle — including create, retrieve, update, complete, and cancel actions — based directly on the April 2026 specification. It logs all requests and responses per API key, allowing developers to diagnose exactly where an agent's behavior deviates from expected protocol. The project is intentionally scoped to ACP only for now, with the developer open to extending support to Google's AP2 and UCP protocols if demand arises.

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