Order Sync for Google Shopping App is mainly for Syncing of Orders and their Updates in between Order Sync for Google Shopping and Shopify backend. This app does not sync products data (feed) from Shopify to your Merchant Center. You can use any other product data feed that is in compliance with the requirement of the Buy on Google Program. 

However, we advise you to use our Feed For Google Shopping for product data (feed) submission to Google Merchant Center.

1. As it syncs, just Order Sync for Google Shopping, you can continue using your existing feeding service without any conflict as far as your product feed is having Variant ID in the Link of each and every product submitted.
2. Merchant already selling on Buy on Google can opt for this App to sync orders automatically from Buy on Google to Shopify.
3. This app avoids manual processing of the orders received on Buy on Google Store. It just uses your Shopify’s Fulfilment process with which merchants either have automatic fulfilment setup or can process the fulfillments manually with the greater ease.
4. Why syncing orders, inventory is updated accordingly if you are tracking inventory on your Shopify Store. So, it becomes very easy to track and manage the inventory quantity.
5. For returned orders, Inventory quantity is added back to Stock automatically in the Shopify using the Order Sync for Google Shopping App.
6. Buy on Google Customers will get the fulfilment details you add in the Shopify’s Dashboard.
7. Issue the refund in part or full easily from the Shopify's interface with which merchants are very comfortable.