OrderCreated
data class OrderCreated(val items: List<OrderItem>, val address: ShippingAddress, val fromCart: Boolean)
Revision 2: the 9.x orderId field is the stream's ref now; upgradeOrderCreatedFrom1 reads the 9.x shape.
Revision 2: the 9.x orderId field is the stream's ref now; upgradeOrderCreatedFrom1 reads the 9.x shape.