DCQL: mandatory + optional groups (student transport pass)

Scenario

A transport authority sells a discounted student pass. Mandatory: PID (identity) AND student status (Student ID card OR Enrolment Letter). Optional (required: false): local-residency proof (Utility Bill OR Rental Agreement) for an additional discount - the wallet presents it only if the holder has and consents to it.

Before you build: run the integrator intake in igrantio-ows-overview - environment, API key, tenancy, backend host, webhooks, frontend - one question at a time, a recommended default with each.