# Webhook-initiated nullifying of inventory

## Flow

Let's say theres at least 1 availability rule which is currently ongoin (after start before end, inventory was already nullified)

..and some1 manually modifies inv for this product to, say, 5

there should be a callback on inventory update from Shopify to our App

App consumes webhook

detects if product is of one of ongoing rules

~~detects if update was user initiated or our app-initiated (in which case we should do nothing)~~

we would just check if the new inv level is > 0

if webhook was user-initiated and product is of ongoing rule then:

product inventory level should be nullified for this product by POST request just like we do this on availability rule start.

## nullifying inventory

curl -X POST 'https://aime-leon-dore-dev-store.myshopify.com/admin/api/2020-10/inventory_levels/set.json' \
-H 'Authorization: Basic blabla=' \
--data-raw '{
    "inventory_item_id": 36439723638921,
    "location_id": 35407921289,
    "available": 0
}'

## Other considerations

Webhooks should be auto-configured for every Shopify shop involved

https://shopify.dev/docs/admin-api/rest/reference/events/webhook

https://shopify.dev/tutorials/manage-webhooks#configuring-webhooks