An API (Application Programming Interface) serves as a collection of protocols, tools, and standards crucial for constructing software applications. Its primary role is to establish how distinct software components interact, enabling seamless communication between programs or services.

Developers harness APIs to seamlessly integrate pre-existing functionality or services into their applications, foregoing the need for ground-up development. Take, for instance, the APIs furnished by social media platforms, facilitating developers in incorporating social media features like post sharing and user data retrieval into their own applications.

APIs manifest diversely, spanning categories like REST APIs, SOAP APIs, and GraphQL APIs. They come with comprehensive documentation detailing their usage, encompassing endpoints, parameters, and anticipated responses.

TAGx leverages a unified API integration to establish a connection between merchants and a multitude of local and global Payment Service Providers (PSPs) of their preference. This integration streamlines the process, enhancing merchant-PSP interactions.