Why should I map Shipment carriers?
Mapping shipping carriers is important as it helps you fulfill orders more efficiently and without error. This will help you avoid any situation where the order is considered to have invalid Tracking details. You need to map Shopify carrier codes with Amazon carrier codes. Such as the carrier code on Shopify is 4PX Express. However, on Amazon, it is named as 4PX as the carrier code.
Now, if you select 4PX Express as the carrier code on Shopify, Amazon will mark an error stating: Invalid Tracking Detail. So map Shopify carrier code: 4PX Express with Amazon carrier code: 4PX only.