You can use webhook subscriptions to receive notifications in a Linx Application about particular events in a Shopify store. After you’ve subscribed to a webhook, you can let your app execute code immediately after specific events occur in shops that have your app installed, instead of having to make API calls periodically to check their status. For example, you can rely on webhooks to trigger an action in your app when a customer creates a cart, or when a merchant creates a new product in their Shopify admin. By using webhooks subscriptions you can make fewer API calls overall, which makes sure that your apps are more efficient and update quickly.

Full solution https://linx.software/shopify-integration/
Sample https://github.com/linx-software/shopify-api-integration