With this setting option, you can map/link the Shopify Shipping carrier with the TikTok Shop shipping carrier. For example, if you ship products from Shopify Shipping carrier DFL but DFL is available on TikTok Shop with another name – DFL US, you can map these shipping carriers. So now, when you ship a product on Shopify using DFL, it will automatically sync and show the TikTok Shop shipping carrier as DFL US. This will prevent any shipping errors.