Reliable Sends in Kotlin

try {
    val result = repost.webhooks.order.created(customerId = "customer-123") { id = "order-123" }
    println("accepted ${result.id}")
} catch (failure: RepostException) {
    when {
        // Repost may already have the event. Reuse the SAME idempotency key and
        // reconcile — never mint a new key, or you risk a duplicate delivery.
        failure.deliveryState == DeliveryState.POSSIBLY_SENT -> reconcile(failure.idempotencyKey)
        // Definitely not sent and safe to retry with the same key.
        failure.isRetryable -> retryLater(failure.idempotencyKey)
        // Terminal failure; the code is stable and carries no payload or credentials.
        else -> throw failure
    }
}

val operation = repost.webhooks.order.createdOperation("customer-123", Order { id = "order-123" })

// Cancelling the coroutine that awaits the send also cancels this operation; here we
// cancel it directly. The delivery outcome still settles and never throws.
operation.cancel(true)
operation.outcome().thenAccept { outcome ->
    if (outcome.deliveryState == DeliveryState.CANCELLED_UNKNOWN) {
        // The request may have reached Repost. Reconcile with the same key.
        reconcile(outcome.idempotencyKey)
    }
}