Tracking information can be provided to Amazon through the Seller Central shipment creation workflow, the Track shipment tab on the Shipment summary page, and through Amazon Marketplace Web Service. For parcel shipments, tracking IDs will be required for every box, where available. For less-than-truckload and full-truckload shipments, a freight progressive number (PRO) will be required for every shipment.
What Is a Pro Number? A PRO number, or PRO tracking number, is used by carriers to organize and track the progress of each shipment. A PRO number is defined in the industry as “progressive + number”.
在 LTL（零担）和 TL（卡车装载）运输的世界中，运输 PRO 编号是累进编号的缩写，是一种订单标识符，它成为托运人跟踪和监管链过程中的重要组成部分给收货人。
