This guide demonstrates how to use Redis PubSub channels with Bytewax for real-time data processing, creating a custom input source and aggregating clickstream data efficiently. The example uses Python scripts as the producer and listener, utilizing the redis-py library for basic operations. A custom input source is created using Bytawax, which reads from a Redis pubsub channel and processes messages in a more streamlined and pythonic way compared to the original listener script. The resulting pipeline can be used to process various types of data streams with minimal changes or modifications. Bytewax's flexibility allows for adaptive data processing requirements, making it suitable for diverse use cases. The example showcases how to create a windowed calculation using Bytawax, highlighting its capabilities and encouraging users to experiment and extend the pipeline logic.