---
title: "Castles Technology S1U2-M4"
url: https://getstell.com/readers/castles-technology-s1u2-m4
description: "Castles Technology S1U2-M4: payment terminal with documented Apple VAS support for reading wallet passes."
---

# Castles Technology S1U2-M4

Castles Technology S1U2-M4: payment terminal with documented Apple VAS support for reading wallet passes.