Documentation

How it works in 4 steps

1. Initiation

Your application redirects to Age4Zero with the minimum required age (example aged:21) :

scope: "openid aged:21"

2. Authentication

The user verifies their identity via Itsme or another recognized official source.

3. Secure verification

Age4Zero confirms the age without storing or transmitting any personal data.

4. Simple response

Return to your application with only the age_verified:true/false and age_required claims.

Technical integration

Standard OIDC flow

Initiate an OIDC “Authorization code flow” (request code and exchange for an id_token)

// Redirect to Age4Zero
const authUrl = `https://verify.age4zero.io/auth?
  client_id=YOUR_CLIENT_ID&
  response_type=code&
  scope=openid aged:21&
  redirect_uri=YOUR_CALLBACK`;

Response via an ID token (for age over 21)

{
  "age_verified": true,
  "age_required": 21
}