Guides
Understanding GS1 Application Identifiers in a Digital Product Passport
When you open a Digital Product Passport for the first time, one of the first things you'll encounter is a product identifier — a structured string of numbers that tells verifying systems exactly what product this credential describes and at what level of granularity. Those identifiers are built on GS1 Application Identifiers (AIs). This post breaks down the three AI codes you'll encounter most in a DPP, what each one means, and why the distinction between model, batch, and serial level matters more than it might initially seem.