Amazon Marketplace Web Service (MWS) will no longer be available after March 31, 2024. All MWS developers must migrate to Selling Partner API (SP-API) to avoid service disruptions. Refer to the Migration Hub for more information.
Call the GetUniquePackageLabels operation to request unique shipping labels for your inbound shipments.
Each shipping label returned by the GetUniquePackageLabels operation should be affixed to the package in the shipment that it corresponds to, so the labels indicate the package contents. This helps to ensure that your shipment is processed at the Amazon fulfillment center quickly and accurately.
To get shipping labels on the right packages, do the following for each shipping label:
In all circumstances, the GetUniquePackageLabels operation returns shipping labels that include a unique bar code and Package ID (the string located directly below the bar code). Depending on the contents of the packages in your shipments, the labels can also include an ASIN and an expiration date.
Shipping labels include an ASIN and an expiration date in either of the following situations:
Shipping labels include an ASIN and no expiration date in either of the following situations:
Shipping labels do not include an ASIN or an expiration date when the shipment contains at least one package with items that do not share the same ASIN and expiration date.