OptionalerrorBounded failure category when the transition represents a failure.
Random identifier shared by events from one sheet presentation.
Monotonically increasing event order within the flow.
ISO 8601 timestamp generated by the native SDK.
Typed lifecycle transition.
A typed lifecycle event for application UI, analytics, and coordination.
paymentAttemptFailedandcheckoutLoadFailedare recoverable: the native sheet remains responsible for displaying the failure and offering a retry. Terminal application behavior belongs in thePaymentSheetResultreturned bypresentPaymentSheet.