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A duplicate webhook should not change inventory twice.
Commerce Sync is my multi-store Shopify integration example. Product changes move between storefronts, and inventory updates make their way back to the parent store.
The part I care about is what happens when something fails. PostgreSQL catches duplicate deliveries, pg-boss keeps jobs durable, and separate workers handle throttling and retries. Partial syncs have a rollback path.
I put the architecture and implementation decisions in the case study below. Client details are removed, and the render is a concept illustration.
I am taking on Shopify app integrations and backend maintenance, remotely from India, up to 20 hours a week.
Catching the duplicates in Postgres is the right place for it, since Shopify can send the same webhook more than once and not always in order. Do you key on the webhook ID header, or on the inventory item plus its updated_at? The second one also saves you when an older update lands after a newer one.
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Commerce Sync: Shopify Inventory and Webhook Integrations
GraphQL
PostgreSQL
Shopify
Shopify Development
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