PayPal is a leading digital payment platform that enables businesses and individuals to send and receive payments securely and conveniently. It offers a range of payment options, including credit cards, debit cards, and bank transfers, and supports transactions in multiple currencies. With millions of active users worldwide, PayPal is a trusted and established platform that provides a safe and reliable payment solution for online transactions. Its platform includes features such as buyer and seller protection, fraud detection, and dispute resolution, which help to ensure a secure and seamless payment experience. PayPal is a convenient and versatile payment platform that supports businesses of all sizes, from startups to enterprise-level companies.

Apache Kafka is a distributed event store and stream-processing platform. It is an open-source system developed by the Apache Software Foundation written in Java and Scala. The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds. Kafka can connect to external systems (for data import/export) via Kafka Connect, and provides the Kafka Streams libraries for stream processing applications.