08Case studyFieldDay
FieldDay. When the buyer is an agent, your store needs to speak the protocol.
In 2026 the AI ecosystem standardised on two emerging checkout standards (the Agentic Commerce Protocol and the Unified Commerce Protocol) to let LLM agents complete purchases on behalf of shoppers. FieldDay was the first merchant the team enabled end-to-end. The team does the bridging.
- Industry
- Cross-merchant
- Headline outcome
- ACP / UCP shipped
Measured the gap between today’s storefront and what an agent needs to transact.
The team walks every catalog endpoint, every checkout step, every webhook, and scores it against the ACP and UCP specifications. For FieldDay the readout was clean and concrete: catalog feed mostly compliant, checkout missing 4 required surfaces, returns/cancellations entirely undefined for agentic flows.
- 2protocols mapped (ACP + UCP)
- 11compliance surfaces graded per catalog
- Day 1enablement runbook from audit to live
Simulated agent checkouts against a sandbox endpoint: every flow before any flow goes live.
Before any production credential is issued, the team runs synthetic agent flows: discover → select variant → add to cart → authenticate as agent → settle → confirm → handle refund/return. Every flow carries the protocol version, the conformance log, and the specific surface that broke.
- Sandbox endpoints provisioned per protocol: ACP and UCP in parallel
- Synthetic agent personas test variants, returns, partial fulfilment, sub-agents
- Conformance log retained per run for the merchant compliance team
Shipped the bindings: feed schema, checkout webhook, agent auth, structured returns.
The team drafts the field-level mapping (live catalog ↔ ACP/UCP fields), the webhook payloads, the agent-auth handshake, and the structured-return contract. The merchant commerce team approves the diff; the agents push it through the existing storefront platform integration.
- Catalog feed → ACP product schema mapping (auto-generated, merchant-approved)
- Checkout webhook bound to the protocol settlement event
- Agent-auth handshake + scope tokens shipped with audit log
- Structured returns/cancellations contract: the surface most merchants miss
Compounded: ACP/UCP enablement is now a templated workflow on the platform.
FieldDay was the first. The mapping the team drafted, and the conformance battery the team ran against the sandbox, is now the same workflow any merchant can trigger when they’re ready. As the protocols evolve the team holds the spec; the merchant holds the storefront. Two parties, one Loop.