Module kernel 

Available on crate feature payments only.

Canonical commerce kernel contracts.

The kernel exposes protocol-neutral command types, state-transition errors, cross-protocol correlation, and backend-facing service traits used by ACP stable 2026-01-30 and AP2 v0.1-alpha (2026-03-22) adapters.

Modules

commands

correlator

Kernel-mediated cross-protocol correlation.

errors

service

Structs

BeginInterventionCommand

Canonical request to start an intervention flow.

CancelCheckoutCommand

Canonical request to cancel a checkout or transaction.

CommerceContext

Shared metadata supplied with canonical commerce commands.

CompleteCheckoutCommand

Canonical request to finalize checkout and produce an order.

ContinueInterventionCommand

Canonical request to resume or complete an intervention flow.

CreateCheckoutCommand

Canonical request to create a checkout session or AP2 cart negotiation.

DelegatePaymentAllowance

Canonical delegated-payment allowance preserved across protocol adapters.

DelegatePaymentCommand

Canonical request to tokenize or delegate a payment credential.

DelegatedPaymentResult

Canonical delegated-payment result returned by payment-token services.

DelegatedRiskSignal

Canonical risk signal attached to delegated-payment requests.

EvidenceLookup

Canonical lookup for one stored evidence artifact.

ExecutePaymentCommand

Canonical payment-execution request shared by ACP and AP2 adapters.

ListUnresolvedTransactionsRequest

Canonical request to list unresolved transactions.

LossyConversionError

Describes an unsafe cross-protocol conversion that the kernel refuses.

OrderUpdateCommand

Canonical order-state update emitted after checkout completion.

PaymentExecutionResult

Canonical payment execution result returned by payment backends.

ProtocolCorrelator

Cross-protocol correlator that routes ACP and AP2 adapters through the same canonical transaction ID and journal model.

StoreEvidenceCommand

Canonical request to persist one evidence artifact.

StoredEvidence

Stored evidence returned by the evidence store.

SyncPaymentOutcomeCommand

Canonical request to sync asynchronous payment outcomes back into the kernel.

TransactionLookup

Canonical lookup by transaction identifier and optional session identity.

UpdateCheckoutCommand

Canonical request to update checkout state before payment execution.

Enums

PaymentExecutionOutcome

Canonical payment outcome type used by the execution service.

PaymentsKernelError

Local kernel errors that map into the ADK structured error envelope.

ProjectionResult

Result of a canonical projection attempt.

ProtocolOrigin

Describes the originating protocol for a correlation operation.

ProtocolRefKind

Describes a specific protocol reference slot in ProtocolRefs.

Traits

DelegatedPaymentService

Backend-facing delegated-payment tokenization operations.

EvidenceStore

Raw evidence storage used to preserve immutable protocol artifacts.

InterventionService

Backend-facing intervention lifecycle operations.

MerchantCheckoutService

Backend-facing checkout operations shared by ACP and AP2 adapters.

PaymentExecutionService

Backend-facing payment execution operations shared by ACP and AP2 adapters.

TransactionStore

Durable structured transaction storage keyed by canonical transaction ID.