The Platform UI application supports several authentication methods to connect to HTTP APIs, including Basic, API Key, Digest, Session, and OAUTH 2, presenting a user interface for creating input fields that might be required. It also provides a step-by-step model for implementing more complex auth workflows, especially OAuth v2. The platform allows users to create private apps, which can encapsulate both the code and the request, making it simpler to use in Zaps, and enables error handling by presenting a UI for configuration. Additionally, it supports REST Hook subscriptions, allowing users to configure dynamic subscription URLs and query parameters, and has limitations such as not supporting file downloads or uploads, and throttling private apps to 100 calls every 30 seconds.