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GS1 Lightweight Messaging Standard for Verification of Product Identifiers

The GS1 Lightweight Messaging Standard for Verification of Product Identifiers is designed to support requests and responses for verification of product identifiers for serialized pharmaceutical products. This standard has been developed and designed to support VRS systems for U.S. DSCSA verification of product identifiers on returned products, the standard defines a verification Request message and a corresponding output response message. It is intended to provide a simple, standardized lightweight messaging framework for asking verification questions and receiving information based on a check of the DSCSA product identifier and associated data.

This standard is the first GS1 technical standard to make use of the new GS1 Digital Link syntax. It enables a basic automated check of a serialized product identifier and the associated expiration date and batch number via a lightweight web-based request/response message pair, initiated by a simple HTTP/HTTPS GET request and returning a lightweight machine-readable response message formatted in JavaScript Object Notation (JSON).

Methods by which a client may interact directly with a known VRS system, using either the checkConnectivity method (1a) or the verify method (2a):


In situations where the requestor does not know in advance which VRS to use for a specific GTIN, they may make use of the resolver or lookup directory infrastructure as shown in Figure 3-2. A lookup directory has its own internal database of redirection, which it uses to match against the GTIN within the GS1 Digital Link web URI, to provide a redirection pointer to the appropriate verification service, depending on information configured by the respective brand owner of that GTIN. To indicate that the client wants to interact with a verification service, the client specifies within the URI query string a linkType value equal to ‘verificationService’. A lookup directory will redirect the request to the appropriate verification service for that GTIN, and the server for the responder will respond.

Figure 3-2 A client may use a lookup directory infrastructure for GS1 Digital Links to be redirected to the appropriate verification service for a specific GTIN, as specified by the respective brand owner:

The role of the lookup directory (LD) is to provide redirection so that instead of the client maintaining its own lookup table mapping every GTIN to a specific URL of a verification service, a resolver or LD provides up-to-date redirection information. To distinguish between the two methods (checkConnectivity and verify) defined for the standardized interface, the client either appends ‘&checkConnectivity=true’ to the GS1 Digital Link URI or does not.

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