The merchant's corresponding refund ID or reference, required (in conjunction with requestId) for safe retries.
The unique, Afterpay-generated refund ID.
A UTC timestamp of the refund creation time, in ISO 8601 format.
A unique reference for the individual refund event. If provided, the value will appear in the daily settlement file as "Payment Event ID". In most cases, this would hold the same value as the merchantReference.