Seeed’s Mission-Critical Integration for Square & CoverManager

How a bespoke, battle-tested solution flawlessly processed thousands of transactions in the high-pressure environment of Off Sónar Barcelona.

The Challenge: Zero-Failure Reliability in a High-Stakes Environment

For major event promoters, managing thousands of attendees requires flawless operational efficiency. At a high-volume, cashless event like the Off Sónar electronic music festival in Barcelona, there is no margin for error. The client faced a significant operational hurdle: their reservation management system, CoverManager, and their payment processing system, Square, operated in separate silos.

This disconnect created critical risks:

Manual Inefficiency: Staff would need to manually reconcile reservations with payments, leading to potential errors and delays.
Poor Guest Experience: Any friction in the payment process could lead to long queues and frustrated attendees, damaging the event's reputation.
Revenue Loss: System downtime or transaction failures in a cashless environment would directly result in lost revenue.

The client needed more than just a simple connection; they needed a robust, scalable, and utterly reliable integration that could withstand the ultimate stress test of a world-renowned festival.

The Seeed Solution: An Agile, Microservices-Driven Integration

As a dedicated B2B Digital Transformation Partner, Seeed was engaged to engineer a seamless, real-time bridge between CoverManager and Square. Our approach combined deep platform expertise with an agile methodology to deliver a solution that was both powerful and resilient.

The core of our solution was a custom-built integration platform powered by a sophisticated microservices architecture. This approach ensures the decoupling and reliability of transactions, allowing different parts of the system to operate independently and efficiently.

Our development process involved several key components:

Secure Authentication & Onboarding: We created a secure integration portal where the client could connect their Square and CoverManager accounts via a standard OAuth 2.0 flow, ensuring all access tokens and credentials were encrypted and handled securely.
Real-Time, Webhook-Driven Sync: We built the system to listen for webhook events from both platforms. When a guest's reservation is marked as "Seated" in CoverManager, a webhook is triggered automatically.
Intelligent Data Processing: Our reservation-service microservice receives the webhook, transforms the reservation data, and creates a corresponding check in the Square POS system in near real-time (with a normal processing delay of under 50 seconds).
Comprehensive Data Synchronization: The integration syncs all critical data points, including customer names, number of guests, reservation notes (like allergies), and pre-paid deposits, ensuring staff have full visibility in the Square POS.
Bidirectional Communication: When a change is made in the Square POS—such as moving a party to a different table—our checks-service microservice detects the restaurant.check.updated webhook and automatically updates the table assignment back in CoverManager, keeping both systems perfectly aligned.

By leveraging our expertise in cloud services and system integration, we delivered a turn-key solution that was ready for the demanding environment of Off Sónar Barcelona.

The Outcome: Flawless Performance Under Pressure

The integration was put to the ultimate test at the Off Sónar Barcelona 2025 festival, and the results exceeded all expectations. The platform performed flawlessly, handling a massive volume of transactions without a single failure and providing a seamless experience for both staff and festival attendees.

Key Impacts:

Proven High-Volume Scalability: The solution demonstrated its ability to perform under extreme load, validating Seeed's capacity to build enterprise-grade, mission-critical systems.
Eliminated Manual Errors: By automating the data flow between reservations and payments, the integration removed the risk of human error, ensuring data accuracy and operational integrity.
Enhanced Operational Efficiency: Staff could manage all guest interactions from their respective platforms, knowing the data was synchronized. Moving tables in Square instantly updated CoverManager, streamlining front-of-house operations.
Solidified a Trusted Partnership: Our proven ability to deliver on a challenging, high-stakes project solidified Seeed's position as a key partner for complex digital transformations, capable of turning ambitious business needs into battle-tested technological realities.

This project stands as a testament to Seeed's ability to not only develop sophisticated software but to engineer robust solutions that deliver unwavering performance when it matters most.