Webhooks Overview

async function handleWebhookEvent(event) {
  // Scope the key by event type: a subscription's key is the same on every
  // one of its lifecycle events.
  const operationKey = event.type_event === "payment.split_update"
    ? event.data.split_update.idempotency_key
    : event.type_event.startsWith("payment.")
      ? event.data.payment?.idempotency_key
      : event.data.idempotency_key;
  if (!operationKey) {
    throw new Error("Missing event key: use an event-specific fallback");
  }
  const key = `${event.account_id}:${event.type_event}:${operationKey}`;

  if (await store.has(key)) {
    // Already processed, acknowledge and skip.
    return;
  }

  await processEvent(event);
  await store.add(key);
}