Test checkout as one end-to-end transaction across the assistant, your merchant checkout and order systems, and your payment service provider (PSP). A convincing assistant message is not proof of a successful order: the merchant’s systems must validate the cart, determine the outcome, and return authoritative state. Before launch, exercise normal and failure paths in a sandbox, verify that every customer-facing message matches that state, and retain evidence from each transition.
Define what a successful checkout means
Write down the expected state transitions before creating test cases. For an implementation using the OpenAI Agentic Checkout Spec, the documented flow starts with a merchant checkout session, updates it as cart or fulfillment details change, emits order lifecycle events, and completes checkout with order identifiers. Your assistant, merchant services, order system, and PSP may use different internal names, but they must agree on what each outcome means.
The merchant’s system is the authority for cart contents, prices, taxes and fees, shipping, discounts, checkout status, and the resulting order. The assistant should present that returned state; it should not invent totals or claim an order succeeded before the merchant confirms it. The merchant remains responsible for validating the order, determining fulfillment, calculating tax, assessing payment and risk signals, charging through its PSP, and accepting or declining the order on its own systems.
- For each transition, specify the initiating request, expected response, resulting checkout and order state, any event to be emitted, and what the customer should see.
- Agree on the meanings of success, decline, cancellation, and pending authorization across the assistant, merchant, and PSP.
- Run tests in a non-production environment with test credentials and the provider’s documented sandbox mechanisms. Do not substitute a mocked assistant response for a test of merchant and payment state.
Build a test matrix around the full transaction
Adapt these scenarios to the checkout protocol and PSP in your stack. A supported outcome may differ by provider; do not mark an unsupported sandbox simulation as a production capability.
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| Area | Scenario and assertion | Evidence to retain |
|---|---|---|
| Session start | Create sessions with and without a shipping address. Check that the response contains a session ID, status, item lines, and required fields for that checkout. | Request and response pair; state trace. |
| Cart mutation | Change quantity, items, discount, fulfillment address, and shipping choice. Check that the returned cart is complete and that totals are recalculated. | Before-and-after payloads; calculation assertions. |
| Customer-facing state | Exercise valid, unavailable, invalid, and incomplete states. Check that the options, messages, and errors shown to the customer match the API response and backend state. | UI capture linked to the matching API response and state. |
| Payment outcomes | Use the provider sandbox to test successful authorization, decline, buyer cancellation, and pending authorization where supported. Check each outcome’s checkout and order state. | Sandbox configuration and provider result; checkout result; resulting order state. |
| Completion | Complete an eligible checkout through the supported tokenized payment path. Check for the final order object, completed state, and returned identifiers. | Request and response logs; order record. |
| Order events | Check that order-created and subsequent order-updated events are emitted, signatures are validated, and each event can be correlated to its checkout and order. | Webhook payloads; signature checks; event correlation IDs. |
| Retry and idempotency | Repeat create and complete requests with the same idempotency key; check that a safe duplicate returns the same result without creating another order or payment side effect. Reuse a key with different parameters and check conflict handling. | Request logs; deduplication, order, and payment records. |
| Request security | Test HTTPS, request authentication and signatures, input validation, least-privilege credentials, safe retry handling, and omission or redaction of sensitive payment data in logs. | Configuration evidence; negative tests; audit logs. |
| Compliance and resilience | Review applicable PCI obligations with the PSP and a qualified security assessor, as appropriate. Check access, incident response, and a disable or rollback path. Repeat behavioral validation after changes to the model, prompt, tools, or payment integration. | Risk review; test run history; ownership and incident procedures. |
Test sessions and cart changes against merchant truth
Session creation
Start with a cart that has all required details, then create a second session without a shipping address if the flow allows that state. Confirm the merchant returns the session identifier and status, item lines, and any required fields or next-step options. Check that the assistant uses those returned details rather than relying on an earlier conversation summary.
Cart and fulfillment updates
Change one variable at a time: quantity, item selection, discount, fulfillment address, and shipping method. For each update, compare the complete returned cart with the prior state. Verify that item prices, taxes and fees, shipping, discounts, total, and status reflect the change. Include an unavailable item or invalid or incomplete input, then confirm the merchant’s response is represented accurately in the interface.
For the OpenAI Agentic Checkout Spec, responses carry full cart state rather than only the field that changed. Tests should therefore catch stale assistant displays—for example, a new shipping choice appearing beside an old total—even if the update request itself succeeds.
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Exercise payment outcomes, not just the happy path
Use the PSP’s sandbox to cover each outcome it supports. Amazon Pay, for example, documents sandbox simulations; other providers may expose different controls and states. Follow the live documentation for the PSP actually in use rather than assuming that test values or simulation steps are interchangeable between providers.
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- Payment is declined: verify that the order is not presented as accepted or paid, that the decline is reflected in checkout state, and that the customer receives an actionable message without exposed internal details.
- The buyer cancels: check that cancellation does not become a completed order and that the assistant offers a clear path to resume or stop, consistent with the merchant’s state.
- Authorization is pending: where supported, check that the interface does not promise completion while the result is unresolved, and that a later update is reflected in the order.
Where delegated payments are used, verify the actual authorization and capture flow that applies to that integration. A sandbox success response alone is not sufficient: compare the provider result, checkout response, order record, and customer-visible outcome.
Verify completion, events, and safe retries
Completion and order records
Complete only a checkout that is eligible under your flow. Confirm that the merchant returns a completed state and order identifiers, and that the order system contains the corresponding final order object. Link the completion request and response to the provider result and order record using your correlation data. A client-side success screen without a matching merchant order is a failed test.
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Order lifecycle events
Inspect order-created and subsequent order-updated events. Validate their signatures, check that the payloads correspond to the expected order state, and confirm that correlation identifiers let the team trace each event to the initiating checkout. Include delayed or repeated event delivery in your checks if your integration can receive it; verify that handling an event does not incorrectly create or alter an order.
Retries and idempotency
Repeat session creation and completion with the same idempotency key. The integration should handle a safe duplicate without producing an extra order or payment side effect. Then reuse the key with different parameters and verify the documented conflict behavior. Inspect both the returned result and stored order and payment records; a response that looks harmless can still hide a duplicate side effect.
Check interface messages and failure behavior
For every scenario in the matrix, capture what the customer sees and match it to the API response and backend state. Test valid, unavailable, invalid, and incomplete inputs; payment declines and cancellations; pending outcomes where applicable; and errors during updates or completion. Confirm that the assistant does not state that an order is placed, a payment is complete, or an item is available unless the merchant’s authoritative response supports that statement.
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Also verify the supporting customer journey: the Agentic Commerce Protocol production readiness guide recommends checking legal and user-experience links such as the Terms of Service and Privacy Policy. Make sure those destinations are available in the actual flow and that error messages offer a useful next action without exposing secrets or sensitive operational details.
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PCI Security Standards Council guidance published by Andrew Jamieson on September 11, 2025, states: “AI systems must be deployed and managed in compliance with applicable PCI SSC requirements.” AI use does not remove applicable payment-security obligations. The guidance also cautions against trusting AI systems with high-impact secrets or unprotected sensitive data, calls for least-privilege access, and recommends ongoing validation because AI systems can be nondeterministic and drift.
Keep payment-data exposure as narrow as the chosen integration permits. The protocol production guide says the Product Feed Spec and Agentic Checkout Spec are designed not to transmit cardholder data. However, PSP forwarding or a direct delegated-payment integration that handles cardholder data may affect PCI scope. Determine the obligations for your actual design with your PSP and a qualified security assessor; do not treat protocol design guidance as a compliance determination.
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- Use test credentials in sandbox scenarios and limit each credential to the permissions its component needs.
- Check that logs, traces, prompts, and error reports do not expose sensitive payment data or secrets.
- Document which system owns validation, payment processing, order state, and incident response.
- Maintain a tested way to disable or roll back the assistant checkout path if it behaves incorrectly.
Keep launch evidence and set a release gate
The Agentic Commerce Protocol production readiness guide asks teams to demonstrate each listed test end to end with request and response logs. Keep those logs alongside the evidence in the test matrix, with sensitive values redacted and enough correlation data to reconstruct a transaction. For each run, record the test case, environment, relevant model, prompt, tool, and payment-integration versions, result, and any defect or exception. This makes later revalidation possible when one of those components changes.
Define launch approval around observed evidence, not an assistant’s conversational confidence. A release is ready only when the team can trace a representative checkout from session creation through the merchant-confirmed order outcome; show that payment exceptions and retries do not create incorrect state or side effects; demonstrate that customer messages match backend truth; and account for the security, compliance, and rollback responsibilities in the deployed design.
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