Zamok Kiosk API
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    setTransactionExternalId: PayloadAC<
        "SET_TRANSACTION_EXTERNAL_ID",
        { externalId: string },
    > = ...

    Set the transaction's provider acknowledgement ID using the modern externalId payload spelling.

    START_TRANSACTION retains the legacy externalID spelling. This action uses externalId and stores it in paymentMethodAckId for compatibility.

    { type: 'SET_TRANSACTION_EXTERNAL_ID', payload: { externalId: 'external-id' } }