Printer SDK – External Receipt Printing Made Easy

About the Project

To support receipt printing as a part of the mobile payment flow, we developed a modular Printer SDK for both iOS and Android. The SDK abstracts device-specific logic behind a simple, consistent interface, enabling receipt printing from external thermal printers without adding complexity to the app layer.

Business Challenge

The client needed to integrate receipt printing into their mobile payment system using a range of external printer devices, each with its own connection method and command set. The solution had to detect available printers and manage device readiness, establish devices connection via different protocols and render receipts using consistent templates and assets.

Contributions

We designed and developed a modular Printer SDK that fits into the client’s payment flow. Our work included:

• Custom plugins per printer model – each plugin handles its own protocol, connection logic, and capabilities
• Device discovery and readiness checks – the SDK automatically detects available printers and monitors their connection state
• Template-based receipt rendering – each printer plugin includes predefined layouts and static assets like logos or headers
• Simple print interface – app-level logic only needs to pass structured data, while the SDK managed what and how to print

Reusable & Scalable Solution

Our solution was built for reusability:

• Each printer is encapsulated in its own plugin, allowing easy expansion
• The SDK can be reused across other apps that require receipts or other printing
• Designed to support new printer models or formats with minimal effort

Key Expertise

• Experience with proprietary printer protocols and hardware communication
• Deep integration with mobile payment workflows, including receipt handling and device state tracking
• A strong focus on modular SDK design that scales across apps and platforms