> ## Documentation Index
> Fetch the complete documentation index at: https://docs.digifist.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Back-in-Stock Notification

> Automatically notify customers when a product variant they subscribed to is restocked.

The back-in-stock notification flow is the delivery engine for the Back-in-Stock module. When a customer subscribes to an out-of-stock variant through the storefront widget, this automation sends them a WhatsApp message the moment that variant's inventory is replenished — no manual intervention required.

This is the simplest recipe in terms of flow structure: a single trigger connected directly to a single action. Its power is in the precision of the delivery — every customer receives a notification only for the specific variant they subscribed to, at the exact moment it becomes available.

## Flow structure

```
Trigger: Back in Stock
→ Action: Send restock notification template with product link
```

## Node-by-node breakdown

### Trigger — Back in Stock

**Trigger:** `BACK_IN_STOCK`
**Source:** Galantis — fires when a subscribed product variant's `inventory_quantity` changes from `0` to a positive value.

This trigger fires only for variants that have active Back-in-Stock subscribers. If a variant is restocked but has no active subscribers, the trigger does not fire. If a variant has 50 active subscribers and is restocked, the trigger fires and the action is executed for all 50 customers.

The trigger is detected via Shopify's `products/update` webhook. When Galantis receives the webhook and detects an inventory change from `0` to `> 0`, it identifies all `ACTIVE` subscriptions for that variant and begins executing this flow for each subscriber.

**Recommended frequency cap:** `24 hours` — protects against edge cases where inventory fluctuates around zero multiple times in the same day, which could otherwise trigger multiple notifications to the same subscriber for the same restock event.

<Note>
  This automation is tightly coupled to the Back-in-Stock widget and subscription system. For the trigger to fire, customers must have subscribed through the widget and their subscription must be in `ACTIVE` status. See [Back-in-Stock — Notification Logic](/whatsapp/back-in-stock/notification-logic) for the full pipeline.
</Note>

***

### Action — Restock notification template

The restock notification is a high-intent message — the customer explicitly asked to be notified. The template should be direct, confirm the specific product is back, and include a clear link to the product page.

Effective restock notification template elements:

* Confirm what is back in stock (product name and ideally the specific variant — size, color, etc.)
* Create urgency where genuine — if the restock quantity is limited, say so
* A direct link button to the product page using a `URL` button type

## No delay required

Unlike most other recipes, this flow deliberately omits a delay node between the trigger and the action. The customer subscribed specifically to receive this notification the moment the product is available. A delay would reduce the value of the notification — if inventory is limited, customers who subscribed later in the day benefit from a faster notification.

## Consent and subscription guardrails

Before sending, Galantis automatically enforces two guardrails:

1. **Subscription status** — Only customers with `ACTIVE` subscription status receive the notification. Customers with `CANCELLED`, `NOTIFIED`, or `PENDING` subscriptions are excluded.
2. **Consent status** — Customers with `UNSUBSCRIBED` or `REDACTED` `marketing_state` are skipped even if they have an `ACTIVE` subscription.

After a notification is sent, the subscription status moves to `NOTIFIED`. A notified subscription does not receive a second notification if the same variant is restocked again in the future — the customer would need to re-subscribe.

## Templates required

| Template             | Purpose                                                       |
| -------------------- | ------------------------------------------------------------- |
| Restock notification | Alerts subscriber that their product variant is back in stock |

## Related guides

* [Back-in-Stock — Notification Logic](/whatsapp/back-in-stock/notification-logic) — Full pipeline from inventory webhook to message dispatch
* [Back-in-Stock — Subscription Lifecycle](/whatsapp/back-in-stock/subscription-lifecycle) — Subscription statuses and how they interact with this flow
* [Triggers](../triggers) — BACK\_IN\_STOCK trigger source and behavior