Abstract: Disclosed are various embodiments of multi-layer identifier labels. In one embodiment, a multi-layer identifier label includes an upper layer bearing a public identifier, a lower layer bearing a private identifier, and an adhesive backing below the lower layer. The upper layer may be removably attached to the lower layer, and the lower layer may be non-visible underneath the upper layer. Peeling away the upper layer to reveal the lower layer may be a tamper-evident action.

Abstract: Disclosed are various embodiments for tracking and verifying the authenticity of items. Public and private unique identifiers are generated for an item, and an identifier label is printed and affixed to the item. The public identifier is visible, but the private identifier is not visible unless a tamper-evident action is performed. Events involving scans of the public identifier are recorded. The private identifier is scanned by a client, and in response, authenticity information for the item is sent to the client. The authenticity information is determined based at least in part on the events relative to the public identifier.

Abstract: Techniques for managing a return request may be provided. For example, a user may want to return an item that the user received from an item provider via an electronic marketplace. The user can take a picture of the item and transmit the image to a computer that determines that the user would like to return the item. The computer may also determine that the item is returnable (e.g., was provided to the user within an allowable timeframe, satisfies a constraint for returning the item). The computer can initiate a return of the item. In some examples, the computer can also determine a convenient return location or the reason that the user is returning the item to the item provider.

Abstract: Techniques are provided herein for utilizing a dynamic geo-fence management engine. The techniques include receiving a set of parameters corresponding to a virtual geographic perimeter. A user may be determined based at least in part on a geographical location of the user and the set of parameters corresponding to the virtual geographic perimeter. A notification for the user may be generated, the notification being formatted according to a push notification service protocol the notification including the set of parameters. The notification may be provided to a remote computing device. Receipt of the notification by the remote computing device may cause the remote computing device to provide, to the user, information related to the virtual geographic perimeter.

Abstract: Disclosed are various embodiments for tracking and verifying the authenticity of items. Public and private unique identifiers are generated for an item, and an identifier label is printed and affixed to the item. The public identifier is visible, but the private identifier is not visible unless a tamper-evident action is performed. Events involving scans of the public identifier are recorded. The private identifier is scanned by a client, and in response, authenticity information for the item is sent to the client. The authenticity information is determined based at least in part on the events relative to the public identifier.

Abstract: Disclosed are various embodiments of multi-layer identifier labels. In one embodiment, a multi-layer identifier label includes an upper layer bearing a public identifier, a lower layer bearing a private identifier, and an adhesive backing below the lower layer. The upper layer may be removably attached to the lower layer, and the lower layer may be non-visible underneath the upper layer. Peeling away the upper layer to reveal the lower layer may be a tamper-evident action.