wtf is did-usecase-visitor?

This repository is a demonstration project built for Taiwan's official digital wallet system, known as MODA wallet.gov.tw. It shows how a company could use digital identity cards for two everyday tasks at once: letting employees badge into a building or sign up for an event, and letting an employee vouch for a visitor so that visitor receives their own temporary digital pass. The project extends an earlier example called did-usecase-HR and adds a second role on top of it. The system plays two parts in the digital identity chain. It acts as a verifier, checking that someone holds a valid employee card before granting access, and it acts as an issuer, creating new digital passes for visitors once that check succeeds. In the employee flow, a staff member shows their digital employee card through the wallet app, the app confirms the card is valid, and access is granted or registration completes. In the visitor flow, a current employee endorses a guest by presenting their own card, and once that endorsement is verified, a time-limited visitor pass is issued straight to the guest's digital wallet. A notable design choice is selective disclosure. The employee card only reveals whether the holder is a valid employee. Personal details like name, birth date, or family information stay private inside the wallet and are never exposed during the check. Technically, the project is an Express application written in JavaScript, split into a static frontend and a JSON API, with a helper module handling calls to the wallet sandbox. State is kept in memory rather than written to disk, which the README notes makes it friendlier to run on Google Cloud Run. The project supports two ways of issuing visitor passes depending on whether a dedicated visitor card template has been configured, falling back to the employee template's fields if not. To run it locally, the setup is a standard npm install followed by npm start. Deploying to Cloud Run requires setting several environment variables, including access tokens for the issuer and verifier sandboxes and the card template identifiers used for employees and visitors.