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# How force sync inventory works based on SKUs within the application?

|| Please note: Your product inventory is synced based on the connected Shopify and Square locations.

![](https://storage.crisp.chat/users/helpdesk/website/-/2/9/4/d/294d0430bb41e400/image_dijurz.png)

###### Let's go through the process and criteria of syncing your inventory based on SKUs step by step:

1. Since inventory sync is based on SKUs, **the same SKUs must exist** in both Shopify and Square.

2. Inventory will sync according to the **Primary Source** selected in the application. You can update this setting anytime from the configuration page.


![](https://storage.crisp.chat/users/helpdesk/website/-/2/9/4/d/294d0430bb41e400/screenshot-2026-07-05-at-92357_wcjsz9.png)

3. **Note:** If Shopify is set as the primary source and duplicate SKUs exist in Shopify, those products will be skipped, and their inventory will not sync.

4. **Shared SKUs in Square:**

* If Shopify is the primary source and when perform **force sync** , inventory will sync for all shared SKUs in Square **only if** the **"Sync Shared SKU Inventory"** setting is enabled.

![](https://storage.crisp.chat/users/helpdesk/website/-/2/9/4/d/294d0430bb41e400/screenshot-2026-07-05-at-92610_r7bmpo.png)
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| If you have any queries or need assistance with this process. Please connect with our support team. We will be more than happy to help you!