Shipping label allows you to attach extra information about your products that help you define your shipping settings in Google Merchant.

Say, for example, it's Christmas season and you want to set up free shipping for only selected products as part of your sales campaign, submit a shipping_label with a value that helps you define those products, such as shipping_label = free for Christmas.

This way, you can group products with shipping_label = free for Christmas and set a free shipping rate for them. Other products that fall into other Shipping services, such as free shipping above a certain order value will remain unaffected.
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