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Commerce V1 uses the CloudEvents 1.0 specification for asynchronous service-to-service communication. Events flow between Commerce and your extension services and processor integrations via the mTLS-secured event bridge.
Diagram showing the Cloud Event Bridge architecture in Commerce V1

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Event Envelope

All events follow the CloudEvents HTTP binding with these required attributes:
AttributeDescription
ce-specversionAlways 1.0
ce-typeIdentifies the event (e.g., CardSessionCreated)
ce-sourceEvent source URI
ce-idUnique event identifier (UUID)
ce-timeRFC 3339 timestamp
Content-Typeapplication/json

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Inbound Events

Events sent to Commerce by your integration services.
EventDescription
CardSessionCreatedSuccessful card session result
CardSessionFailedCard session could not be completed
TDSResultOutcome of a 3-D Secure challenge
FinishTransaction result from an integration service

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Outbound Events

Events sent by Commerce to your integration services.
EventDescription
CompleteTDSSessionOutcome of a 3-D Secure session
SessionVoidedA payment session was voided
StateChangedPayment state changed
Custom Transaction EventFlow reached a transaction node
UbersichtEventPayment lifecycle notification
CustomerCreatedA new customer was created
PaymentMethodSetupChangedPayment method setup status changed
SettlementEventSettlement activity on a payment