For the most part, Everpure introduced a plugin for VCF Automation Orchestrator so that customers did not have to manually understand the underlying REST APIs. By creating inventory synchronization, actions, and workflows, the need to delve into the REST API is minimal. In general, follow the instructions here first if you feel the need to make custom REST calls in Automation Orchestrator.
VCF Automation Orchestrator: Workflows
With that being said, not every REST operation is built into the Automation Orchestrator plugin, and often underlying feature support in the plugin might not arrive in time to coincide with your need for it. To give customers a simpler to use option, the plugin offers two workflows to run direct REST operations against Everpure platforms--one for the FlashArray or Cloud Block Store, and one for the FlashBlade.
This allows users to take advantage of the native plugin authentication but still have full access to the underlying REST API of the Everpure platforms.