POS to cash register integration SDK for a retail systems provider

In payment ecosystems, speed matters but integration complexity often slows everything down. Connecting POS devices, banks, and electronic cash register (ECR) systems requires handling multiple protocols, devices, and transaction flows.

For Prolaz, a gateway provider connecting merchants, banks, and payment processors, this complexity directly impacted their ability to scale efficiently and onboard partners faster.

The goal was clear: reduce friction in integration without compromising reliability.

Instead of solving each integration case individually, we helped Prolaz take a more scalable approach turning integration into a reusable product.

We designed and developed a .NET SDK that allows Electronic Cash Register systems to communicate with POS devices in a consistent and predictable way.

This shifted the model from rebuilding integrations repeatedly to providing a standardized, ready-to-use solution.

For the business, that meant faster onboarding and lower operational overhead.

A key part of the project was not just implementation, but defining the communication protocol itself.

POS integrations rely on accurate, real-time data exchange. Even small inconsistencies can lead to:

• Failed transactions
• Data mismatches
• Operational delays

We worked closely with Prolaz to define a protocol that ensured clear structure, predictable behavior, and reliable transaction handling.

This created a foundation that could support multiple partners without introducing instability.

The SDK wasn’t delivered as raw code, it was built as a complete, production-ready package.

This included:

• A fully functional SDK distributed via NuGet
• Comprehensive documentation for fast adoption
• Automated tests to ensure reliability
• Transaction logging for traceability and debugging

For developers integrating the system, this meant one thing: less guesswork, faster implementation, fewer errors.

POS systems are inherently complex, involving multiple devices and systems that must stay in sync. When integrated correctly, they enable real-time data exchange, faster transactions, and fewer manual errors.

By standardizing integration through the SDK, we helped Prolaz:

• Reduce dependency on custom, one-off implementations
• Minimize integration-related bugs
• Ensure consistent behavior across deployments

This significantly lowered long-term maintenance costs and reduced the risk of failures in production.

For a gateway provider like Prolaz, growth depends on how quickly new partners can be onboarded.

With the SDK in place, integration became:

• Faster to implement
• Easier to test
• More predictable to deploy

This directly supported the company’s ability to expand its network and bring solutions to market faster, without increasing technical complexity.

By the end of the engagement, Prolaz had more than an integration solution - they had a scalable integration layer packaged as a product.

The SDK enabled:

• Faster partner onboarding
• Reduced development effort per integration
• More reliable transaction handling

Most importantly, it eliminated a common bottleneck in payment systems: integration complexity that slows down business growth.