OneSiam Super App

The Challenge

ONESIAM needed to elevate the premium mall experience from offline retail into a Luxury Omnichannel Marketplace — connecting online and offline seamlessly across the Siam Piwat ecosystem.

The complexity wasn’t just building an e-commerce app. It required a system serving multiple stakeholders simultaneously: customers shopping in-mall and from home, merchants, shoppers/runners, operations teams, accounting, and the Loyalty, Parking, and Payment systems of Siam Piwat — all within a single unified flow.

A single order could span products from multiple stores across different mall zones, requiring the platform to handle order management, fulfillment, payment, refunds, returns, and reconciliation at a far more granular level than standard e-commerce. ONESIAM chose Muze to deliver both the platform foundation (inCart) and the deep customisation needed for a luxury retail ecosystem of this scale.

What We Built

Muze developed the OneSiam Super App and end-to-end marketplace backend — covering every stakeholder: Customer App, Shopper/Runner Flow, Tenant Management, Back-office Reconciliation, Parking Integration, CRM & Loyalty, and Social Shopping Feed.

The system supports Multi-Store Orders where items from multiple merchants combine into a single transaction, with a complete runner workflow for in-mall collection, and a back-office layer that splits revenue, reconciles payments, and handles returns and refunds per tenant. VIZ Card, Point Redemption, and Parking integration make the app a genuine part of the in-mall journey.

Impact