Pusher announced the retirement of its chat product, Pusher Chatkit, effective April 23, 2020, giving users less than 30 days to transition to a different service. PubNub Chat is suggested as an alternative, offering a reliable, scalable, and feature-rich chat API that aims to enhance user engagement with preloaded features such as message reactions and profanity filters, and supports unlimited concurrent connections and channels. PubNub emphasizes ease of migration, providing integrations with third-party services like Google Translate and IBM Watson, alongside a robust real-time communication platform for extending chat functionalities to include notifications and live events. The guide outlines how PubNub handles user connections, room creation, message sending, and message retrieval, highlighting its flexibility and compliance with global legislative standards. PubNub also offers expert support to ensure seamless migration and optimal operation of chat applications.